What you didn’t know about traffic under signal control (TUSC)

The traffic under signal control, otherwise know as a TUSC by TM operatives, is a handy way to exclude a traffic light from a side street. This use potentially frees up a temporary traffic signal from a job for use elsewhere or helps an operative set out less equipment but is it being used correctly? From my conversations with learners, operatives and operations managers the answer is no.

The traffic under signal control can only be used when any traffic reaching the end of the junction can see all other traffic signals being used in the operation and can be used with three-way and four-way lights as long as the driver can still see all over light heads.

A traffic under signal control must be used with its sister board the joining traffic not signal controlled. The joining traffic not signal control sits ahead of the traffic signals ahead sign and before the narrow lanes.

Finally, according to the traffic signs and regulations the joining traffic under signal must be placed beside a ‘other danger ahead’ sign, which is basically just an exclamation mark in a triangle warning sign.

For more information see the attached drawing.