High-Risk Corridors
US 36, the Northwest Parkway, and Wadsworth Boulevard
The Denver-Boulder Turnpike (US 36) is Broomfield's primary artery and a documented black-ice corridor: freezing drizzle that forms thin invisible ice near the Church Ranch Boulevard exit has caused fatal crashes in prior winters. The Northwest Parkway is a 9.05-mile limited-access toll road running between US 36 at Interlocken Loop and the I-25/E-470 interchange, where a fatal and serious-injury crash occurred at the southbound I-25 to southbound E-470 ramp in April 2024. Wadsworth Boulevard (Colorado SH 121) at SH 36 and again at 120th Avenue rank among Broomfield's highest-crash intersections per the city's 2016 Transportation Plan. US 287, which overlaps SH 128 along the 120th Avenue corridor, is another documented problem area, particularly at the 287/10th Avenue intersection. Impaired drivers traveling these routes after last call pose concentrated crash risk to other motorists.