Longest Roads Length Comparison (KM Continuous)
Compare the 10 longest roads by signed continuous length, from Pan-American at 30,000 km to Stuart Highway at 2,720. Lengths in km with authority specs.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Pan-American Highway Longest road system. Gap breaks driving. | 30,000 kilometers | Alaska to Argentina, with Darien Gap break | Pan-American guides: about 30,000 km road system |
| Asian Highway 1 Longest Asian route here. | 20,557 kilometers | Tokyo to Turkey border, UN route | UNESCAP AH1 spec: 20,557 km |
| Trans-Siberian Highway Longest national highway here. | 11,000 kilometers | St Petersburg to Vladivostok, Russia | Russian road guides: Trans-Siberian about 11,000 km |
| Cairo-Cape Town Highway Longest African route here. | 10,228 kilometers | Egypt to South Africa, African Union route | AU Trans-African spec: Cairo-Cape Town 10,228 km |
| Trans-Canada Highway 3,179 under Trans-Siberian. | 7,821 kilometers | Victoria to St John's, Canada | Transport Canada TCH spec: 7,821 km |
| Golden Quadrilateral India 24,154 under Pan-American. | 5,846 kilometers | Delhi Mumbai Chennai Kolkata loop | NHAI Golden Quadrilateral spec: 5,846 km |
| US Route 20 Longest US numbered road. Ranks above I-90; see notes. | 5,415 kilometers | Oregon to Massachusetts, USA, kept for scale | FHWA US 20 spec: 5,415 km |
| US Interstate 90 Longest US Interstate here. | 4,860 kilometers | Seattle to Boston, USA | FHWA I-90 spec: 4,860 km |
| National Highway 44 India Longest Indian highway here. | 3,745 kilometers | Srinagar to Kanyakumari, India | NHAI NH44 spec: 3,745 km |
| Stuart Highway Australia Outback anchor. | 2,720 kilometers | Darwin to Port Augusta | Australian guides: Stuart Highway 2,720 km |
About this converter
Pan-American runs about 30,000 km from Alaska toward Argentina with the Darien Gap break, about 9,400 clear of Asian Highway 1 at 20,557. Trans-Siberian at about 11,000, Cairo-Cape Town at 10,228, Trans-Canada at 7,821, Golden Quadrilateral at 5,846, US Route 20 at 5,415 for scale, I-90 at 4,860, NH44 at 3,745 and Stuart Highway at 2,720 follow. Lengths count signed continuous routes with gaps noted. Highway traffic totals rank on a separate road page, so vehicles per day stay out here.
How to use it
Pick two roads and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try Pan-American against Stuart Highway to see the 11 times gap. The bars below use a log scale since max runs 11 times min, so small bars stay visible. Switch the unit to miles for US figures. Ratios are exact divisions of the route lengths.
US Route 20 at 5,415 ranks above I-90 at 4,860 despite draft table quirks. Pan-American about 30,000 breaks at the Darien Gap, so driven totals run lower. Traffic totals rank on busiest-highway-traffic, so this page keeps lengths only. Figures follow highway authority specs.
FAQ
What is the longest road?
Pan-American at about 30,000 km. The Darien Gap breaks driving.
How long is the Trans-Siberian Highway?
About 11,000 km from St Petersburg to Vladivostok. Longest national highway here.
Is this the same as traffic?
No. Traffic totals rank elsewhere. This page keeps route lengths.
Does Pan-American drive fully?
No. The Darien Gap breaks it. Boats bridge Panama and Colombia.
Sources
- Highway authority specs route lengths: Pan-American about 30,000 with Darien Gap; Asian Highway 1 UNESCAP 20,557; Trans-Siberian about 11,000; Cairo-Cape Town AU 10,228; Trans-Canada 7,821; Golden Quadrilateral NHAI 5,846; US Route 20 FHWA 5,415 scale; I-90 FHWA 4,860; NH44 NHAI 3,745; Stuart Highway 2,720 km
Last verified: 2026-10-09 · 10 entries
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