The tracks are designed to be mounted to the underside of existing highway sign trusses and bridges. This would allow for an unobstructed view of traffic flowing beneath. The tracks are made of two C-channels running parallel to each other spaced approximately a foot apart. The track is connected parallel to the bottom of supporting structure using I-beams that double as track separators. The entire track system can hold up to 50 lb. of trolley load.

The four-wheeled trolley will ride along these tracks to traverse the freeway. Mounted to the underside will be the detection device. The trolley will be powered via a DC motor and a front wheel drive system facilitating mobility and allowing it to be positioned above any desired lane of traffic.

Four brakes are implemented to hold the trolley in position, one at every corner of the platform. Each brake comprises an extending mechanism that is attached to the trolley and raises a brake pad to engage the track. When the trolley platform stops moving, the brakes will extend and engage the tracks. This prevents the trolley from moving in a strong wind and/or slightly sloping tracks.