Explained road conditions at major highway choke points

Certain highway locations experience recurring traffic slowdowns due to their geography, elevation, and weather patterns. These pages explain why specific choke points are prone to congestion and delays. Each explanation is supported by visual evidence from traffic cameras showing current conditions. This section focuses on situational context rather than real-time traffic monitoring.

Sea-to-Sky Highway (BC) — Mountain corridor between Vancouver and Whistler
Coquihalla Highway (BC) — Mountain highway connecting the Lower Mainland to Interior BC
Snoqualmie Pass (WA) — Mountain pass on I-90 through the Cascade Range
Lookout Pass (ID) — Mountain pass on I-90 at the Idaho-Montana border
Vail Pass (CO) — High-elevation pass on I-70 prone to winter slowdowns
Eisenhower–Johnson Tunnels (CO) — High-altitude tunnels on I-70 through the Continental Divide
Monarch Pass (CO) — High-elevation pass on US Highway 50
Donner Pass (CA) — Historic mountain pass on I-80 through the Sierra Nevada
Grapevine (CA) — Steep grade on I-5 connecting the Central Valley to Los Angeles
Cajon Pass (CA) — Mountain pass on I-15 connecting the Inland Empire to the High Desert
Afton Mountain (VA) — Mountain pass on I-64 through the Blue Ridge Mountains
Fancy Gap (VA) — Mountain pass on I-77 through the Blue Ridge Mountains

These pages are updated regularly and focus on situational context.