Question

1.4. A driver with 20/20 vision travels at 55mph and desires to exit a freeway at an exit ramp. There are two lanes in the direction of his travel, namely the shoulder (outer) lane and the inside (inner) lane. The driver can read a sign at 55 ft per inch of letter height and has a perception-reaction time of 2 sec. If the height of the letters on the sign is 5 in, the exit speed is 30 mph, the lane width is 11 ft, f-0.15, and the terrain is level, determine: a. The minimum distance the sign should be placed ahead of the ramp exit. b. If the sign is side mounted 6 ft from the edge of the shoulder lane and the driver is positioned 4 ft from the outside edge of the inner lane, is the sign in the cone of vision of the driver?

Answer 1

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