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?

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?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Q2/ driver moving at speed of 43.8 mi/h with average acceleration = 1.43 he decides to pass the car on the right lane , the initial time for maneuver = 4 sec and the time of the passing vehicle is traveling in left lane =10 sec . determine the required distance to pass the vehicle ?
I need the answer as soon as possible
The design speed of a multilane highway is 70 mi/h. Determine the following. Note: The term a g in the appropriate equation is typically rounded to 0.35 in calculations. Assume perception reaction time = 2.5 sec. (a) the minimum stopping sight distance (in ft) that should be provided for a level roadway ft (b) the minimum stopping sight distance (in ft) that should be provided for a roadway with a maximum grade of 6 percent. ft
A driver with 20/20 vision traveling at 55 mph in the median lane desires to exit the freeway at the exit ramp. If 5-in. letters are used, what is the minimum distance the sign should be placed ahead of the ramp exit? (Some assumptions that would be helpful are perception-reaction time = 2 sec; exit speed = 30 mph; deceleration rate = 4.80 ft/s2 a driver with 20/20 vision can read a sign at 55 ft per inch of letter height.) Discuss your results.
2 A slight bend prior to a curve means that a 65 km/h curve advisory speed sign is not visible to drivers until 95 m before the start of the curve. The 85th percentile speed of vehicles on this approach, prior to reaction and braking, has been measured by survey as 88 km/h. If it is assumed that it is desirable for vehicles to slow down to the posted 65 km/h-advisory speed before reaching the curve, what is the required distance to achieve this? Is the available sight distance adequate for this?
Q- 32 b
I need the answer quickly
Compute the intermediate sight distance for a freeway with a design speed of 80kph if the perception time is assumed to be 2.5 seconds with a skid resistance of 0.70. Assume brake efficiency to be 60%.
Calculate the passing sight distance on a two lane road having the design speed of 86 kmph and reaction time 2 sec. Assume one way traffic. Take acceleration of overtaking and overtaken vehicle as 3 m/s2 and 1.5 m/s2 respectively. Assume that overtaken vehicle starts accelerating after the reaction time of overtaking vehicle. Take space headway as 18 m.
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 kmn/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 drive 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