IMSA Signal Inspector case studies
IMSA Signal Inspector · Put your knowledge to work in context.
The IMSA Traffic Signal certification is one of the credentials listed in the International Municipal Signal Association's certification portfolio, alongside Work Zone Temporary Traffic Control, Signs and Markings, Roadway Lighting, and Fiber Optics. IMSA describes its certifications as industry-leading and reports that 24,000+ professionals currently hold one. The credential is aimed at practitioners who build, inspect, and maintain traffic signal systems - municipal signal staff, contractor technicians, inspectors, and consultants working on publicly owned signal infrastructure. This study resource organizes preparation around four domains weighted equally at 25% each: traffic signal inspection and field verification; controllers, cabinets, and electronics; signal display, detection, and wiring standards; and work zone safety, construction coordination, and records. The IMSA Signal Inspector case studies are 5 cases and about 3,868 words.
1Final Acceptance of a New Span-Wire Intersection
Final field inspection of a newly constructed four-leg span-wire intersection. The major street is posted 45 mph with two through lanes in each direction; the minor street is posted 30 mph.
776 words, about 4 min2Conflict Monitor Lockout After a Storm
An intersection controlled by a NEMA TS-2 Type 2 cabinet with a 170E controller and an 8-phase, 16-channel conflict monitor went dark during a thunderstorm. Utility power was restored after three hours, but the signal remains in flashing mode on all approaches.
800 words, about 4 min3Intermittent Left-Turn Loop Detection After Rain
During a post-installation inspection of a new left-turn lane on a four-lane arterial, you find that the left-turn call is intermittent. The lane is controlled by a 6-foot by 30-foot quadrupole loop saw-cut into the pavement, with a 450-foot lead-in to the cabinet.
753 words, about 4 min4Ten-Day Signal Shutdown at a School Route
A widening project requires relocating the existing span-wire signal at a four-leg intersection. The contractor proposes to turn off the signal for 10 working days, bag the signal heads, and use two flaggers on each approach from 7 a.m.
816 words, about 4 min5Railroad Preemption Wired to the Island Circuit
An intersection is 90 feet from a highway-rail grade crossing on a 60 mph rail line. The traffic signal is interconnected with the railroad's warning system.
723 words, about 4 min