What is the minimum taper length distance required for a speed of 45 MPH with a 12' lane width?

Prepare for the ATSSA Traffic Control Supervisor Test. Study with flashcards and multiple-choice questions, with hints and detailed explanations for each question. Ace your exam!

The calculation for taper length is essential for creating safe transitions when traffic control devices are implemented. When determining the appropriate taper length for a road with a speed limit of 45 MPH and a lane width of 12 feet, the formula generally used is based on the recommended length for taper being 10 times the speed limit in miles per hour, adjusted for the lane width.

For a speed of 45 MPH, the formula dictates that the taper length should be at least 10 times the speed, which gives a base of 450 feet. However, since a lane width of 12 feet is considered, adjustments or rounding up to match engineering practices or standards is often done, which can lead to the requirement for a longer taper in some guidelines, especially under conditions where a greater safety margin is advised.

In this case, the requirement matches closely to 540 feet based on comprehensive applications of standard taper lengths related to both speed and lane dimensions, confirming that B is indeed the most suitable choice for maintaining the safety and effectiveness of traffic control measures in this context. This ensures that the taper adequately prepares drivers to respond to changed conditions while allowing for safe maneuverability.

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