High-crash corridors for commercial trucks
C-470, I-25, and US-85 (Santa Fe Drive)
State Highway 470 (C-470) runs along the northern edge of Highlands Ranch as a CDOT-maintained freeway connecting US-85 and I-25 in Lone Tree. Commercial trucks use C-470 as a beltway transition between the I-25 freight corridor and local delivery routes serving Douglas County. The South Broadway and C-470 interchange at the western edge of Highlands Ranch has been ranked the number-one most dangerous intersection in Douglas County by the Douglas County Sheriff. Two road workers were killed there in 2012. US-85 (Santa Fe Drive) runs along the western edge of Highlands Ranch and is a designated dangerous corridor. Interstate 25 runs just east of Highlands Ranch through Lone Tree, carrying significant southbound freight. The Lincoln Avenue and RidgeGate Parkway interchange on I-25 is a documented high-accident location where multi-vehicle crashes involving commercial vehicles have been widely reported. Elevation in Highlands Ranch ranges from approximately 5,800 to 6,200 feet, meaning freeze-thaw ice conditions are common on highway ramps and overpasses from fall through spring, creating additional hazards for heavy trucks that fail to adjust speed or chain up.