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Speed reduction of all traffic approaching a conventional plaza after divergence with any express lanes has been a prime concern for toll agencies. With the increasing use of ETC technologies within the conventional plaza, particularly ETC dedicated lanes, there is greater concern for vehicles approaching and departing at excessive speeds resulting in speed differentials with adjacent users that stop to pay the indicated toll or to take a ticket. Although there is less maneuvering on the departure side than the approach side of a conventional plaza, variation in the acceleration performance of different vehicles and types/classes of vehicles complicates the merging of vehicles as lanes reduce to the available continuous mainline lanes. The speed attained after leaving the plaza should match the prevailing mainline travel speed when merging, which may be prevented when following slower moving trucks.
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