Colorado Governor Jared Polis's House Bill 23-1123 took effect on August 7, 2023, requiring drivers to move over a lane whenever they encounter any stationary vehicle on a highway with hazards flashing and, if a lane change is not possible, slow to at least 20 mph below the posted speed limit, according to the Colorado Department of Transportation. The change broadened the original Move Over duty beyond emergency responders to all hazard-light vehicles.
Operator takeaway
If your trucks transit Colorado, the speed-reduction rule travels with every disabled vehicle on the shoulder. Update your driver training and your customer-facing collateral to reflect both the lane change and the 20 mph cushion.