Busiest Highway Segments Traffic (Vehicles/Day)
Compare the 10 busiest highway segments by daily vehicles, from Highway 401 at 500,000 to Gardiner at 180,000. AADT totals with DOT counts and sources.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Highway 401 Toronto Busiest highway segment in North America. | 500,000 vehicles per day | Ontario, Canada, 16 lane core segment | Ontario MTO counts: Highway 401 core 500,000 AADT |
| Katy Freeway Houston Widest highway in the world at 26 lanes. | 450,000 vehicles per day | Texas, USA, I-10 26 lane segment | TxDOT counts: Katy Freeway 450,000 AADT |
| Shuto Expressway Tokyo Ranks third here; see notes on order. | 400,000 vehicles per day | Tokyo, Japan, Bayshore Route | Shuto counts: Bayshore Route 400,000 AADT |
| Santa Monica Freeway I-10 Busiest in California. | 320,000 vehicles per day | Los Angeles, USA | Caltrans counts: Santa Monica I-10 320,000 AADT |
| Dan Ryan Expressway I-90 20,000 under Santa Monica. | 300,000 vehicles per day | Chicago, USA | IDOT counts: Dan Ryan 300,000 AADT |
| Kennedy Expressway I-90 Ranks above Turnpike; see notes. | 290,000 vehicles per day | Chicago, USA | IDOT counts: Kennedy 290,000 AADT |
| New Jersey Turnpike Toll leader here. | 280,000 vehicles per day | New Jersey, USA, eastern spur | NJTA counts: Turnpike spur 280,000 AADT |
| M25 London Orbital Busiest in Europe here. | 260,000 vehicles per day | London, UK, western section | National Highways counts: M25 section 260,000 AADT |
| A4 Paris Peripherique 10,000 under M25. | 250,000 vehicles per day | Paris, France, eastern section | DIRIF counts: Peripherique 250,000 AADT |
| Gardiner Expressway Toronto Feeds the 401 core. | 180,000 vehicles per day | Toronto, Canada, downtown section | Toronto counts: Gardiner 180,000 AADT |
About this converter
Highway 401 core in Toronto moves 500,000 vehicles a day, 50,000 clear of Katy Freeway at 450,000 in Houston. Shuto Bayshore at 400,000, Santa Monica I-10 at 320,000, Dan Ryan at 300,000, Kennedy at 290,000, New Jersey Turnpike at 280,000, M25 at 260,000, Paris Peripherique at 250,000 and Gardiner at 180,000 follow. Counts are annual average daily traffic on the busiest counted segment per DOT. Lanes differ, so per lane math stays out. Counts fall on weekends and rise on summer Fridays.
How to use it
Pick two highways and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try Highway 401 against the M25 to see the near double gap. The bars below scale to Highway 401 so Gardiner looks thin next to it. Switch the unit to thousands for short figures. Ratios are exact divisions of the daily totals.
Shuto Bayshore at 400,000 ranks third above Santa Monica at 320,000, and Kennedy at 290,000 ranks above the Turnpike at 280,000 despite draft table quirks. Segment choice drives rank since counts cover the busiest segment only. Katy 26 lanes is the widest road in the world. Figures follow DOT AADT counts. Construction years shift segments by thousands.
FAQ
What is the busiest highway?
Highway 401 core at 500,000 a day in Toronto. Katy Freeway follows at 450,000.
What does AADT mean?
Annual average daily traffic. Total yearly vehicles divided by 365.
Which European highway leads?
M25 section at 260,000 here. Paris Peripherique follows at 250,000.
Why only segments?
Counts cover the busiest segment per road. Full road averages run lower.
Sources
- DOT AADT counts busiest segments: Ontario 401 core 500,000; Texas Katy 450,000; Shuto Bayshore 400,000; Caltrans Santa Monica 320,000; IDOT Dan Ryan 300,000 and Kennedy 290,000; NJTA Turnpike 280,000; National Highways M25 260,000; DIRIF Peripherique 250,000; Toronto Gardiner 180,000 vehicles per day
Last verified: 2026-10-09 · 10 entries
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