Road signs play a vital role in traffic safety by guiding drivers, maintaining order and preventing crashes. Michigan sees more than 1,065 traffic‑related deaths each year, and effective, well‑maintained signs help save lives, reduce injuries and property damage, and improve traffic flow.
MDOT routinely replaces traffic signs along highway corridors through a fully federally funded statewide program focused on improving safety. Sign supports located near the road can become hazardous if struck, so crews replace sign posts at the same time as old signs to ensure they meet breakaway safety standards. Coordinating these replacements enhances safety and reduces costs.
A wrong‑way warning system detects vehicles entering a freeway in the wrong direction and activates high‑intensity red LED lights on wrong‑way signs to alert the driver. This technology helps prevent one of the most serious types of traffic crashes.
MDOT uses fluorescent yellow reflective sheeting as the standard background for warning signs to improve visibility and contrast. This inexpensive material makes signs brighter and easier to see, and is added as warning signs are replaced on MDOT roads. This enhancement increases overall safety by making signs more noticeable.
MDOT now requires reflective post sheeting on several types of signs because it improves safety and nighttime visibility. The reflective material helps drivers see the sign and understand the road's path, providing an added operational benefit. This enhancement makes specific signs easier to notice and interpret at night.
Retroreflectivity refers to a sign’s ability to reflect light back to drivers, helping them see and read signs at night. These reflective properties fade over time due to weather, sun exposure and other damage, making timely replacement essential. Brighter, highly retroreflective signs improve visibility for all drivers, especially older adults, and help reduce nighttime crashes.
