About: Speed Sensors
MoDOT speed sensor pole
Traffic speeds on Gateway Guide are determined using speed sensors. More than 200 sensors, either in the pavement, or mounted along the roadway, monitor the traffic speeds in all lanes of the roadway.
These sensors help monitor the speeds on the interstates and arterial roadways and provide automated alerts when traffic speeds significantly dip along those routes. These alerts let Transportation Management Center operators know of potential situations along the roadway. After an alert, operators can view cameras along the roadway and dispatch the appropriate emergency response forces.
Drivers can also check traffic speeds along interstate routes on Gateway Guide – helping them make better choices on the routes they want to use for their commutes, or other travel around the St. Louis region. Traffic is rated as green (moving at least 45 mph), yellow (moving between 31 and 45 mph) and red (moving at 30 mph or slower).
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