IMSA Signal Construction case studies
IMSA Signal Construction · Put your knowledge to work in context.
This page is an independent study resource for candidates preparing for the IMSA Traffic Signal certification - the signal construction credential that the International Municipal Signal Association lists among its core certification areas, alongside Work Zone Temporary Traffic Control, Signs and Markings, Roadway Lighting and Fiber Optics. IMSA describes itself as a public safety association with a membership of more than 10,000 and around 20 U.S. The IMSA Signal Construction case studies are 5 cases and about 2,493 words.
1Plan, Special Provision, and Utility Conflict at a Suburban Signal
A plan set for a new traffic signal at a suburban intersection shows 165 ft of 2-in Schedule 40 PVC conduit from the controller cabinet to the northwest strain pole. The general notes require 30 in of cover under pavement, 24 in under unpaved shoulder, and 5 ft of horizontal clearance from water mains.
617 words, about 3 min2Foundation Stakeout Conflict with an ADA Ramp
A mast arm pole with a 45-ft arm is planned for the southeast corner of an intersection. The survey crew stakes the foundation at station 12+45, 6 ft behind the face of curb.
483 words, about 2 min3Conduit Crossing Under an Arterial with a Sewer Conflict
A 4-in PVC conduit run must cross a 62-ft-wide four-lane arterial. The plan shows 24 in of cover under the pavement, but the local agency's standard requires 36 in under arterial roadways.
456 words, about 2 min4Span Wire Sag and Clearance After Tensioning
A span wire is to be installed between an existing wood utility pole and a new steel strain pole across a 78-ft span. The assembly supports three signal heads and one street-name sign.
473 words, about 2 min5Conflict Monitor Flash and Detection Faults at Turn-On
At a new eight-phase intersection, the controller is powered and the conflict monitor goes into flash whenever phases 2 and 6 receive simultaneous vehicle calls. The contractor's electrician has meggered the home-run feeder to phase 2 and reads 0.5 MΩ to ground; the other phases read above 100 MΩ.
464 words, about 2 min