IMSA Traffic Signal I case studies
IMSA Traffic Signal I · Put your knowledge to work in context.
The IMSA Traffic Signal I credential - sometimes called Traffic Signal Technician Level I or TST Level I - is an entry-level certification offered by the International Municipal Signal Association for people who build, inspect, and maintain traffic signal systems. It is aimed at new technicians, public works and street department employees, contractor personnel, and anyone moving from general roadway work into signalized intersection work. The IMSA Traffic Signal I case studies are 5 cases and about 3,572 words.
1Night Outage at a Four-Leg Signal: Alone in a Bucket Truck
on a Friday, a technician arrives at a four-leg signalized intersection of a 40 mph arterial and a collector street. Every signal head is dark.
743 words, about 4 min2Residents Want a Signal at a Stop-Controlled T
A neighborhood association asks for a traffic signal at a T-intersection where the minor street is stop-controlled. The major street is a two-lane road posted 35 mph carrying about 900 vehicles per hour in the peak hour, both directions combined.
721 words, about 4 min3Span Wire Across a 70-ft Crossing: Will the Conductor Carry It?
A crew is installing a new span-wire signal at a 70-ft-wide crossing. The controller cabinet is on the near-right corner, and the wire run from the cabinet terminal block to the farthest signal head on the span is 320 ft along the messenger.
740 words, about 4 min4Side Street Waits Three Minutes at an Actuated Intersection
At an eight-phase actuated intersection, the side street is a single lane that serves both through and left turns, with its stop line 40 ft back from the near edge of the major-street travel lanes. Residents complain that the side street waits more than three minutes in the morning peak.
707 words, about 4 min5A New Signal Goes to Flash After the First Rain
A new span-wire intersection was energized on Monday. By Thursday's rainstorm the signal had dropped to flashing red on the arterial and flashing yellow on the side street.
661 words, about 3 min