7-8 Day Classic Circuit • 青甘大环线自驾路书

Qinghai-Gansu Grand Loop The Ultimate 2,600 km Silk Road Circuit

The definitive day-by-day self-drive route through northwest China. Circle China’s largest salt lake, photograph surreal emerald brine pools and water yardangs in the Qaidam Basin, explore UNESCO Mogao Caves, and conquer the vibrant Rainbow Danxia and Qilian Mountain G227 pass. 100% legal for foreign motorists with zero permit barriers.

Total Span
2,600 km
Xining circular loop
Duration
7 – 8 Days
Perfect pacing
Foreign Clearance
100% Open
No tour guide required
Peak Season
Jul – Aug
Canola blossom carpets

100% Unrestricted Foreign Self-Drive Clearance

The Qinghai-Gansu Grand Loop traverses entirely through Qinghai and Gansu provinces along public civilian highways (G109, G315, G30, G3011, and G227). Foreign travelers holding a valid passport and Chinese Provisional Driving Permit can freely rent cars in Xining or Lanzhou and drive independently. No Tibet Travel Permits, military border clearances, or mandatory tour guide escorts are required.

Springboard Airport: Pick up rental car at Xining Caojiapu Airport (XNN)
Road Pavement: 98% modern asphalt and divided multi-lane expressways

The 4 Core Driving & Safety Rules of the Grand Loop

Vital regulations on highway safety, desert refueling, and advance UNESCO cave bookings.

100% Unrestricted Foreign Self-Drive Clearance

Freely rent and drive with passport, visa, and Chinese provisional driving permit

Both Qinghai and Gansu provinces are open civil transportation regions. Foreign drivers do NOT need a Tibet Travel Permit (TTP), military clearance, or commercial tour guide. You only need your original passport, Chinese provisional driving permit (临时机动车驾驶许可), and car rental agreement.

Strict Photo Ban on G315 "U-Shaped Highway" Surface

Never stop your vehicle on the active highway travel lane or sit on the asphalt for photos

The dramatic rollercoaster rises of G315 near Dachaidan became a viral social media photo sensation. However, heavy 49-ton mineral trucks crest these blind rises at 80 km/h with limited stopping distance. Traffic police deploy drone surveillance and issue severe fines (200 RMB + 3 demerit points) for stopping on the roadway. Pull completely into designated scenic viewing laybys.

Fuel Management Across the Qaidam Desert Basin

Refuel at every opportunity; follow the strict "Half-Tank Rule" between Dachaidan and Dunhuang

The desert stretch across the Qaidam Basin from Dachaidan through the Water Yardangs to Dunhuang spans over 450 kilometers with sparse fueling outposts. Remote desert stations occasionally undergo maintenance or experience fuel tanker delivery delays. Always top up your tank to 100% in Dachaidan.

Advance Online Reservation for Dunhuang Mogao Caves

Book "Type A" official tickets 30 days in advance via the official WeChat mini-program

To protect fragile thousand-year-old Buddhist murals, the Dunhuang Academy strictly caps daily visitor entries. Standard Type A tickets (including 8 caves + 2 digital cinema shows) sell out weeks in advance in July and August. Foreign passport holders can book directly using their passport numbers and request an English-speaking guide at no extra charge.

7-Day Step-by-Step Road Trip Itinerary

Precise daily distances, driving times, elevation profiles, highway conditions, and verified overnight stops.

Day 1

Xining → Riyue Mountain → Qinghai Lake → Chaka Salt Lake (西宁 → 日月山 → 青海湖 → 茶卡镇)

300 kmApprox. 4.5 hours
Elevation Profile: 2,200 m (Xining) → 3,520 m (Riyue Pass) → 3,200 m (Qinghai Lake) → 3,050 m (Chaka)
Road Condition: G109 National Highway / S89 Chaka Expressway (Divided 4-lane expressway and paved national highway)

Scenic Highlights: Crossing Princess Wencheng’s historic Riyue Mountain Pass, panoramic views of Qinghai Lake’s sapphire waters framed by July golden rapeseed flowers, sunset photography at Chaka Salt Lake ("Mirror of the Sky").

Recommended Overnight: Chaka Town (3,050 m) — Multiple salt-lake boutique themed hotels with foreign guest authorization
Alternate / Detour: Take the Northern Qinghai Lake bypass (Gangcha County / S301) if holiday traffic peaks on the southern shore.
Day 2

Chaka Salt Lake → Delingha → Xiaochaidan Lake → Dachaidan (茶卡 → 德令哈 → 小柴旦湖 → 大柴旦)

400 kmApprox. 4.5 hours
Elevation Profile: 3,050 m (Chaka) → 2,980 m (Delingha) → 3,170 m (Dachaidan Emerald Lake)
Road Condition: G3011 Liuge Expressway & G315 (Smooth, straight, divided 4-lane desert expressway)

Scenic Highlights: Driving across the hyper-arid Qaidam Basin, poet Haizi’s beloved oasis city of Delingha, passing cobalt-blue Xiaochaidan Lake, sunset reflections over the vibrant green brine pools of Dachaidan Emerald Lake (翡翠湖).

Recommended Overnight: Dachaidan Administrative Zone (3,170 m) — Modern desert boutique hotels and apartment suites
Alternate / Detour: Stop at the Delingha Alien Ruins (外星人遗址) junction if fascinated by geological mystery formations.
Day 3

Dachaidan → G315 U-Shaped Highway → Water Yardangs → Dangjin Pass → Dunhuang (大柴旦 → 水上雅丹 → 当金山 → 敦煌)

460 kmApprox. 6.0 hours
Elevation Profile: 3,170 m (Dachaidan) → 2,680 m (Water Yardangs) → 3,648 m (Dangjin Pass) → 1,140 m (Dunhuang)
Road Condition: G315 National Highway roller-coaster grades transitioning to G3011 mountain expressway descent

Scenic Highlights: The famous undulating G315 "U-Shaped Highway" ridge, the world’s only Water Yardang Geopark (乌素特水上雅丹), crossing the high Dangjin Mountain pass into Gansu, descending 2,500 vertical meters into Dunhuang oasis.

Recommended Overnight: Dunhuang City Center (1,140 m) — Luxury Silk Road resort hotels (Silk Road Dunhuang Hotel, Tianhe, etc.)
Alternate / Detour: If skipping the Water Yardangs detour to save 120 km, drive directly from Dachaidan north to Dunhuang via G3011 (360 km, 4.5 hours).
Day 4

Dunhuang Silk Road Culture: Mogao Grottoes & Mingsha Shan (敦煌莫高窟 → 鸣沙山月牙泉)

40 km (local driving)Approx. 1.0 hour total
Elevation Profile: 1,140 m (Dunhuang oasis basin)
Road Condition: Paved, wide urban boulevards and landscaped scenic access avenues

Scenic Highlights: UNESCO World Heritage Mogao Caves (莫高窟) with pre-booked English-speaking expert guides, afternoon camel trekking across Mingsha Shan Singing Sand Dunes, sunset reflections at Crescent Lake (月牙泉).

Recommended Overnight: Dunhuang City Center (1,140 m) — Walk to the vibrant Shazhou Night Market for yellow noodles and apricot tea
Alternate / Detour: Add an afternoon excursion to the western Great Wall frontier outposts of Yumen Pass (玉门关) and Yangguan (阳关).
Day 5

Dunhuang → Guazhou Giant Sculptures → Yumen → Jiayuguan (敦煌 → 瓜州雕塑群 → 玉门 → 嘉峪关)

380 kmApprox. 4.0 hours
Elevation Profile: 1,140 m (Dunhuang) → 1,170 m (Guazhou) → 1,660 m (Jiayuguan Pass)
Road Condition: G30 Lianhuo Expressway (High-speed 4-lane divided expressway, 120 km/h speed limit)

Scenic Highlights: Tasting sweet Hami melons at Guazhou roadside bazaars, photographing giant outdoor Gobi sculptures ("Son of the Earth" / 大地之子), the colossal wind turbine farms of Yumen, exploring the Ming Dynasty Great Wall Fortress at Jiayuguan.

Recommended Overnight: Jiayuguan City (1,660 m) — Modern 4-star and 5-star commercial hotels with full foreign registration
Alternate / Detour: Detour 15 minutes north of Jiayuguan Fort to climb the steep Overhanging Great Wall (悬壁长城).
Day 6

Jiayuguan → Linze → Zhangye Rainbow Danxia (嘉峪关 → 临泽 → 张掖七彩丹霞)

230 kmApprox. 2.5 hours
Elevation Profile: 1,660 m (Jiayuguan) → 1,480 m (Zhangye)
Road Condition: G30 Lianhuo Expressway connected to dedicated Danxia tourist park expressway spur

Scenic Highlights: Morning departure across the fertile Hexi oasis corridor, arriving in Zhangye to visit the indoor Giant Buddha Temple (大佛寺), late afternoon photography of the vivid layered mineral siltstone of the Rainbow Danxia (七彩丹霞).

Recommended Overnight: Danxia Town (Danxiakou) or Zhangye City (1,480 m) — Boutique tourist town hotels adjacent to park gates
Alternate / Detour: Visit the rugged, less-crowded Binggou Danxia (冰沟丹霞) 15 km west for towering red sandstone palisades and pillars.
Day 7

Zhangye → G227 Highway → Biandukou → Qilian Prairie → Menyuan → Xining (张掖 → 扁都口 → 祁连草原 → 门源 → 西宁)

340 kmApprox. 5.5 hours
Elevation Profile: 1,480 m (Zhangye) → 3,500 m (Biandukou) → 3,792 m (Jingyangling Pass) → 2,200 m (Xining)
Road Condition: G227 National Highway (China’s most scenic landscape corridor, well-paved two-lane mountain highway)

Scenic Highlights: Climbing the crimson canyon of Biandukou into the glaciated Qilian Mountain range, crossing the boundless Qilian Prairie dotted with grazing yaks, the million-acre golden canola carpet of Menyuan, returning to Xining.

Recommended Overnight: Xining City Center (2,200 m) — Sofitel, Wanda Vista, or airport transit hotels; vehicle return
Alternate / Detour: If you have an extra day, take Provincial Highway S302 west from Biandukou to spend a night in Swiss-like Qilian County (卓尔山).
Transparent Trip Economics

Estimated 7-Day Self-Drive Budget Model (2 Travelers)

Transparent cost breakdown based on authentic rental car rates, expressway tolls, UNESCO park tickets, and quality hotels:

Expense CategoryEstimated Cost (RMB)Approx. (USD)Operational Breakdown
Rental Vehicle & Fuel (Sedan or SUV / 7 Days)3,800 – 6,200 RMB~$530 – $870 USDBased on compact SUV (Haval H6) or sedan rental in Xining plus ~1,600 RMB gasoline (92#/95#) for 2,600 km.
Expressway Tolls (S89, G3011, G30)380 – 520 RMB~$53 – $73 USDTolls apply on expressway sections (Xining to Chaka, G30 Hexi Corridor). National Highway G227 is 100% toll-free.
Scenic Area Tickets & Eco-Shuttles1,800 – 2,600 RMB~$250 – $360 USDCovers Qinghai Lake Erlangjian, Chaka Salt Lake mini-train, Dachaidan Emerald Lake, Mogao Caves Type A, and Zhangye Danxia.
Hotel Accommodations (7 Nights / 2 Travelers)3,500 – 6,800 RMB~$490 – $950 USDQuality foreign-authorized hotels in Chaka, Dachaidan, Dunhuang (2 nights), Jiayuguan, Zhangye, and Xining.
Dining & Specialty Food (7 Days / 2 Travelers)1,800 – 3,000 RMB~$250 – $420 USDQinghai roasted yak ribs, Tibetan yogurt, hand-grabbed mutton (手抓羊肉), Dunhuang yellow noodles with donkey meat.
Estimated Total Per Person (Double Occupancy)5,700 – 9,500 RMB~$790 – $1,330 USDHighly economical self-drive budget covering rental car, fuel, tolls, upscale hotels, all UNESCO tickets, and meals.

Seasonal Climate Windows & Canola Bloom Timing

The high Northwest plateau displays sharp seasonal contrast from midsummer golden canola fields to crystal autumn skies.

Peak Summer (July – August)

Canola Bloom & Lake Blues (5 / 5 Stars)
Temperatures: 16°C to 28°C daytime, cool 10°C to 15°C nights

The crown jewel season of the Northwest. Millions of acres of bright yellow canola flowers carpet the shores of Qinghai Lake and Menyuan valley against sapphire water and snowcapped peaks. Cool, refreshing alpine temperatures provide relief from eastern China’s summer heat.

Operational Caution: Peak domestic holiday crowds; book Mogao Caves tickets 30 days in advance; reserve hotels early.

Golden Autumn (September – October)

Crisp Skies & Autumn Foliage (4.8 / 5 Stars)
Temperatures: 8°C to 22°C daytime, dropping near 0°C at salt lake basins

Crystal-clear sapphire skies, zero rainfall, and stunning autumn colors across Qilian mountain birch forests. Harvest season fills oasis bazaars with sweet melons and grapes. Tourist crowds drop significantly after September 1st.

Operational Caution: Chilly night temperatures at Dachaidan and Chaka (bring a thermal fleece jacket); sunset is earlier (~19:30).

Late Spring (May – June)

Low Crowds & Awakening Steppes (4 / 5 Stars)
Temperatures: 10°C to 24°C, pleasant daytime touring

Migratory birds flock to Qinghai Lake Bird Island; grasslands turn vibrant fresh green. Salt lakes are calm and mirror-flat with minimal wind ripple. Excellent hotel rates and effortless ticket availability.

Operational Caution: Occasional brief dust squalls in the Gobi desert; canola flowers in Menyuan have not yet bloomed.

Winter (November – April)

Snow-Dusted Silence (Specialist Trip)
Temperatures: -15°C to 4°C, bone-dry freezing cold

Qinghai Lake freezes into giant turquoise ice plates; snow dusts the Great Wall and Dunhuang sand dunes. Deeply atmospheric with virtually zero tourists. Off-season half-price tickets at Mogao Caves.

Operational Caution: Chaka Salt Lake scenic train may suspend operations; black ice on mountain passes; requires winter tires.
Photography Pro-Tip: Bring red, yellow, or vivid blue clothing for visiting Chaka Salt Lake and Emerald Lake. The vibrant fabric colors create stunning high-contrast reflections against the mirror-like white salt crusts. A circular polarizing filter (CPL) is essential to cut surface water glare.

Vehicle Selection & Fleet Recommendations

Covering 2,600 km across salt flats, desert basins, and mountain passes requires reliable automotive capability.

Compact SUV (Top Pick)

e.g. Haval H6, Geely Xingyue L, Honda CR-V. Higher ground clearance easily navigates uneven salt-flat parking lots and gravel viewing turnouts. Roomy trunk accommodates multiple large suitcases and drinking water cases.

Midsize Sedan (Economical Option)

e.g. VW Passat, Toyota Camry. Outstanding fuel economy across 2,600 km of flat expressway, and lower center of gravity provides excellent high-speed stability against Yumen desert crosswinds.

Gasoline ICE over Pure BEV

While G30 has fast chargers, long desert gaps on G315 across the Qaidam Basin lack high-power DC charging. High summer AC load and 120 km/h cruising drain batteries quickly. Gasoline ICE ensures seamless 5-minute fill-ups.

Bilingual Emergency Flashcards for Northwest Motorists

Cell phone voice translation apps will drop offline in remote desert stretches. Screenshot these verified Mandarin and Pinyin emergency cards to present to police officers, toll operators, or gas station attendants.

Checking Foreign Provisional License with Traffic Police
警官您好!我们是外国自驾游客,持有合法护照和中国车管所核发的临时机动车驾驶许可。请检查我们的证件。
Jǐngguān nínhǎo! Wǒmen shì wàiguó zìjià yóukè, chíyǒu héfǎ hùzhào hé Zhōngguó chēguǎnsuǒ héfā de línshí jīdòngchē jiàshǐ xǔkě. Qǐng jiǎnchá wǒmen de zhèngjiàn.
Hello officer! We are international tourists holding legal passports and Chinese provisional driving permits issued by the vehicle administration bureau. Please inspect our documents.
Gas Station Refueling Inquiry in Qaidam Desert
师傅您好,请帮我加满95号(或92号)汽油。请问可以用微信或支付宝扫码支付吗?请开具电子发票。
Shīfu nínhǎo, qǐng bāng wǒ jiāmǎn jiǔshíwǔ hào (huò jiǔshí’èr hào) qìyóu. Qǐngwèn kěyǐ yòng Wēixìn huò Zhīfùbǎo sǎomǎ zhīfù ma? Qǐng kāijù diànzǐ fāpiào.
Hello sir, please fill up with 95 (or 92) gasoline. Can I pay using WeChat Pay or Alipay QR code? Please issue an electronic tax invoice.
Mogao Caves Foreign Passport Ticket Pickup
您好,我们在官方小程序预订了今天的莫高窟门票。我们持有外国护照,请问在哪个窗口办理护照核验并换取纸质门票?
Nínhǎo, wǒmen zài guānfāng xiǎochéngxù yùdìng le jīntiān de Mògāokū ménpiào. Wǒmen chíyǒu wàiguó hùzhào, qǐngwèn zài nǎge chuāngkǒu bànlǐ hùzhào héyàn bìng huànqǔ zhǐzhì ménpiào?
Hello, we booked Mogao Caves tickets online today with foreign passports. Which service window handles passport verification and paper ticket collection?
Expressway Breakdown Assistance (G30 / G3011)
我们在高速公路发生车辆爆胎故障,车辆已停在应急车道并放置三角牌。请协助呼叫高速救援拖车。
Wǒmen zài gāosù gōnglù fāshēng chēliàng bàotāi gùzhàng, chēliàng yǐ tíng zài yìngjí chēdào bìng fàngzhì sānjiǎopái. Qǐng xiézhù hūjiào gāosù jiùyuán tuōchē.
Our car suffered a tire blowout on the expressway. We have parked on the emergency shoulder with warning triangle deployed. Please call highway rescue.

Frequently Asked Questions (FAQ)

Detailed answers covering vehicle rental, Mogao Caves ticket reservations, G315 photo rules, and altitude management.

Can foreign tourists legally rent a car and drive the Qinghai-Gansu Grand Loop independently?

Yes, 100% legally and without any tour agency or permit restrictions. Both Qinghai and Gansu provinces are standard open civil travel regions. Foreign passport holders who obtain an official Chinese Provisional Driving Permit (临时机动车驾驶许可) can rent a vehicle at Xining Caojiapu Airport (XNN) or Lanzhou Airport (LHW) and drive the entire 2,600 km loop completely independently. You do not need a tour guide, government escort, or Tibet Travel Permit (this loop stays entirely north of the Tibet Autonomous Region boundary).

What is the starting and ending city for the Qinghai-Gansu Grand Loop?

Xining (the provincial capital of Qinghai) is the traditional and most logical springboard for the circular loop. Renting your car in Xining allows you to drive counter-clockwise: Xining → Qinghai Lake → Chaka Salt Lake → Dachaidan → Dunhuang → Jiayuguan → Zhangye → Qilian Mountains (G227) → returning to Xining. Alternatively, you can start in Lanzhou (Gansu), which is connected to Xining by a 1.5-hour high-speed train or a 2.5-hour highway drive.

How severe is altitude sickness along the Qinghai-Gansu Loop?

Altitude on this loop is mild to moderate compared to Tibet. Xining sits at 2,200 m, Qinghai Lake at 3,200 m, Chaka at 3,050 m, and Dachaidan at 3,170 m. When you cross into Gansu at Dunhuang, elevation drops to a warm, oxygen-rich 1,140 m. The highest mountain passes on the driving route (Riyue Mountain at 3,520 m and Jingyangling on G227 at 3,792 m) are crossed in your vehicle without sleeping at the summit. Mild symptoms (light headache, breathlessness on stairs) may occur on Days 1 and 2; drink plenty of water, avoid heavy alcohol, and carry a portable oxygen canister in the car.

Can a standard sedan drive the entire 2,600 km loop, or is an SUV mandatory?

Over 98% of the Qinghai-Gansu Grand Loop is paved with modern high-speed expressways (G30, G3011, S89) and well-maintained national highways (G109, G315, G227). A standard compact sedan (such as a Volkswagen Lavida or Toyota Corolla) can easily drive the entire route during the spring, summer, and autumn seasons. However, renting a compact or midsize crossover SUV (such as a Haval H6 or Geely Boyue) provides greater ground clearance for occasional unpaved parking lots at salt lakes, higher seating positions for admiring vast desert horizons, and more luggage room.

How do I book tickets for the Mogao Grottoes in Dunhuang with a foreign passport?

Booking in advance is mandatory during high season (June through October). The official Mogao Grottoes WeChat mini-program ("莫高窟参观预约网") allows booking up to 30 days in advance. Select "Type A Ticket" (which includes 8 caves and two digital cinema shows), choose your entry time slot, and enter your foreign passport number. On the day of your visit, take your physical passport to the "Online Booking / Foreign Passport Ticket Collection" window at the Mogao Caves Digital Exhibition Center to print your paper pass. The Dunhuang Academy provides professional English-speaking guides at no additional charge.

What is the "U-Shaped Highway" on G315, and is it legal to take photos there?

The "U-Shaped Highway" refers to dramatic undulating highway dips and roller-coaster rises through mineral-rich sandstone dunes on National Highway G315 near Dachaidan (approx. KM 780). While it is visually stunning, stopping your vehicle on the road surface or sitting in the traffic lane to pose for photos is STRICTLY ILLEGAL and enforced by police drone patrols and mobile speed cameras. Stopping in an active 80 km/h lane where heavy mineral trucks have blind crests is suicidal. Park only at designated paved viewing turnouts and photograph from the roadside shoulder.

When is the best time to see the yellow canola flowers at Qinghai Lake and Menyuan?

The golden canola bloom peaks from July 10 to August 5 each year. During these three to four weeks, the southern shores of Qinghai Lake (near Erlangjian) and the entire Menyuan basin along G227 are covered in vibrant yellow flower carpets contrasting against deep blue alpine water and glaciated Qilian peaks. If traveling in September, the flowers are harvested, but the birch forests of the Qilian Mountains turn brilliant golden-orange.

Where can I refuel and what fuel grades are available?

PetroChina and Sinopec mega-stations are located in every town: Xining, Huangyuan, Chaka, Delingha, Dachaidan, Dunhuang, Guazhou, Yumen, Jiayuguan, Zhangye, and Menyuan. 92# and 95# gasoline and 0# diesel are universally available. Mobile payment (WeChat Pay / Alipay) and Chinese bank cards are accepted at all pumps. Between Dachaidan and Dunhuang across the desert, fuel stations can be 150 km apart—never depart Dachaidan without a 100% full tank.

Can electric vehicles (EVs) complete the Qinghai-Gansu Grand Loop?

While State Grid (国家电网) fast-charging stations have been installed at major expressway service areas along G30 and G3011, driving a pure battery EV through the remote Qaidam Desert Basin (G315 Water Yardangs section) remains challenging due to sparse charging facilities and long distances between towns. Strong desert crosswinds and highway speeds of 120 km/h also increase EV battery drain by 25% to 35%. A gasoline engine (ICE) or plug-in hybrid (PHEV) ensures seamless travel without charging anxiety.

Are hotels along the loop authorized to accommodate foreign passport holders?

In major cities (Xining, Dunhuang, Jiayuguan, Zhangye), almost all 3-star, 4-star, and 5-star hotels have electronic foreign guest registration capabilities. In smaller rural stopovers like Chaka Town and Dachaidan, most modern commercial hotels and boutique inns cater to foreign tourists. When booking on Trip.com, use the "Foreign Guests Welcome" filter, or contact the front desk in advance to confirm they can scan your passport into the local public security system.

What is the speed limit and how is it monitored along the loop?

Expressway sections (G30, G3011, S89) generally have a speed limit of 120 km/h for passenger cars and 100 km/h for heavy trucks. National Highway G227 through the Qilian Mountains has a speed limit of 60 to 80 km/h, dropping to 40 km/h through town settlements. Traffic police heavily utilize section average speed cameras (区间测速) on G30 and G3011. Always run Amap (高德地图) connected to Bluetooth audio for real-time camera alerts and speed chime warnings.

What clothing and gear should I pack for the Qinghai-Gansu Loop?

Because the route spans elevations from 1,140 m to 3,800 m, layered clothing is essential: (1) A windproof and waterproof shell jacket; (2) A warm fleece or lightweight down jacket for cool mornings at Chaka and Qinghai Lake; (3) High-UV polarized sunglasses (essential for cutting intense glare on the white salt crusts of Chaka and Emerald Lake); (4) Broad-spectrum sunscreen (SPF 50+) and lip balm for dry desert air; (5) Bright red, white, or blue clothing for striking high-contrast photography on the white salt flats.

Next Step: Connect Your Northwest China Road Trip

Explore companion road guides across western China, car rental desks in Xining and Lanzhou, and custom trip planning services.