Chapter 4: Operational Considerations
Section 1: Overview
Introduction
How a traffic signal will be operated and maintained needs
to be considered along with the initial design and installation.
This chapter covers several operational considerations, including
coordination, preemption, and flashing operation. How a traffic
signal interacts with adjacent signals, railroads, and emergency
vehicles is important to the effectiveness of the transportation
system.
Equipment Repair
Failed equipment should be repaired by qualified personnel
only. If the equipment is still under the manufacturer’s warranty,
it should be sent to the manufacturer for repair. To minimize down
time, spare units should be kept in stock for use while equipment
is shipped for repair.