A sign is required to be put up asking drivers to slow down to 30 km/h before entering Zone Y (see figure). On this road, vehicles require 174 m to slow down to 30 km/h the distance of 174 m includes the distance travelled during the perception reaction time of drivers). The sign can be read by 6/6 vision drivers from a distance of 48 m. The sign is placed at a distance of x m from the start of Zone Y so that even a 6/9 vision driver can slow down to 30 km/h before entering the zone. The minimum value of x is m. Direction of vehicle movement. Road - Sign X Start of Zone Y Zone Y

A sign is required to be put up asking drivers to slow down to 30 km/h before entering Zone Y (see figure). On this road, vehicles require 174 m to slow down to 30 km/h the distance of 174 m includes the distance travelled during the perception reaction time of drivers). The sign can be read by 6/6 vision drivers from a distance of 48 m. The sign is placed at a distance of x m from the start of Zone Y so that even a 6/9 vision driver can slow down to 30 km/h before entering the zone. The minimum value of x is m. Direction of vehicle movement. Road - Sign X Start of Zone Y Zone Y

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter7: Intersection Design

Section: Chapter Questions

Problem 27P

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Q- 32 b
Transportation engineering.
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Calculate the minimum length of overtaking zone of a one way traffic road if the velocity of the overtaking and the overtaken vehicles are 110 and 60 kph, and the acceleration of the vehicle is 1.2 m/s^2. (Hint: overtaking sight distance is just a third of minimum length of overtaking zone).
A direction sign is needed before a highway off-ramp. The highway 85th percentile of 50 mph. Vehicle normally make the turn (enter the ramp) at the design speed of 25 mph and cars travel at a constant speed of 50 mph during the perception-reaction time. Using perception reaction time of 1.5 seconds to read and understand the sign and a deceleration (braking) rate of 0.3g, what is the minimum distance the direction sign should be installed in advance of the ramp?
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