05/28/2026
VDOT is testing out a new congestion warning system on I-64 over Afton Mountain this summer. The system will warn travelers about traffic congestion and prepare everyone to slow down.
VDOT is testing a new congestion warning system on I-64 over Afton Mountain to enhance safety for motorists traveling along the corridor. The system is expected to be fully operational this summer, after testing is complete.
The system uses detection sensors installed along the eastbound and westbound mountain grades to continuously monitor traffic speeds and traffic flow. When sensors detect stopped vehicles or significant speed reductions indicating congestion, flashing warning lights automatically activate to alert approaching drivers to use caution and prepare to slow down.
The congestion warning system is expected to be most active during peak travel periods, when traffic volumes increase along the corridor, and may also activate when incidents such as vehicle crashes or disabled vehicles cause traffic to slow or stop. By providing advance notice of sudden slowdowns, the system helps reduce the risk of rear-end crashes and improves overall driver awareness on steep mountain inclines.
The installation of this technology reflects VDOT’s continued commitment to proactive, data-driven safety improvements across both districts, particularly in areas where terrain and traffic patterns create higher crash risks.
In addition to the congestion warning system, VDOT will upgrade interchange lighting at I-64 exit 99 (Afton). This portion of the project is scheduled to go under construction by this summer.
