The Corridors
US 36, US 287, and the Diagonal
Boulder's heavy-truck routes are the danger zones. US 36, the Denver-Boulder Turnpike, runs through Boulder on 28th Street under CDOT maintenance, and Boulder County's Vision Zero program has recorded multiple fatalities from head-on and single-vehicle crashes on the US 36 corridor. The US 287 corridor has seen numerous head-on and speed-related crashes, and Colorado 119, the Diagonal Highway between Boulder and Longmont, has logged curve-related crashes and motorcyclist fatalities. Colorado 7, the Arapahoe Avenue extension running east toward US 287, is also CDOT-maintained.