Flashing or warning beacons are positioned by some agencies next to lane-use signals, centered over the toll collection lanes. Other overhead applications include at the left and right sides of the overhead lane signs mounted on the toll plaza canopies. Besides overhead locations, beacons are sometimes installed on crash blocks or ramparts on the toll island to draw attention to the location of the toll island as users approach the plaza, particularly under adverse weather and poor lighting conditions.
The survey of toll agencies found that use of flashing beacons for ETC dedicated lanes is common, although the most common use is mounting flashing beacons on toll island concrete, at a height of 1.6 to 4 feet. The beacons are normally flashing, though some use steady burns. The beacons are either 8 or 12 inches diameter and yellow or amber in color.
The MUT13D 2003 provides guidelines for general design and operations of flashing beacons. The standard design should follow the provisions for traffic control signal features, with a flashing rate between 50 and 60 times per minute.
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