A driver will exit from a major road to enter a minor road via a ramp. From a distance of d1, he sees the EXIT sign located at d2 m before the exit RAMP (designed as a circular curve). He has to slow down to enter the RAMP safely while moving over the distance of (d1 + d2) on a 2-percent downgrade. He can read a road sign at a distance of 15 m for each 30 mm of the letter height. He will move along the ramp on a 3% downgrade and come to a complete stop at the STOP sign to enter the minor road as shown in the following figure: UrampEXIT SIGNRAMPStop signMaximum speed on the major road - 110 km/hMajor road grade - -2.0 %Letter height of the road sign = 65 mmPerception reaction time of the driver = 2.5 secMaximum superelevation on the ramp, e = 0.06 m/mDetermine the distance d,Determine the minimum distance from the exit sign to the ramp (d,) to obey the speed limit of 50 km/h at the beginning the ramp (a = 3.41 m/s?and g= 9.81 m/s?).Determine the ramp's minimum radius, R (choose proper f, value for the speed given).Determine the minimum length of the ramp, dz.MINOR ROAD

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Answered: Determine the distance d,. Determine…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A driver will exit from a major road to enter a minor road via a ramp. From a distance of d1, he sees the EXIT sign located at d2 m before the exit RAMP (designed as a circular curve). He has to slow down to enter the RAMP safely while moving over the distance of (d1 + d2) on a 2-percent downgrade. He can read a road sign at a distance of 15 m for each 30 mm of the letter height. He will move along the ramp on a 3% downgrade and come to a complete stop at the STOP sign to enter the minor road as shown in the following figure:

Uramp
EXIT SIGN
RAMP
Stop sign
Maximum speed on the major road - 110 km/h
Major road grade - -2.0 %
Letter height of the road sign = 65 mm
Perception reaction time of the driver = 2.5 sec
Maximum superelevation on the ramp, e = 0.06 m/m
Determine the distance d,
Determine the minimum distance from the exit sign to the ramp (d,) to obey the speed limit of 50 km/h at the beginning the ramp (a = 3.41 m/s?
and g= 9.81 m/s?).
Determine the ramp's minimum radius, R (choose proper f, value for the speed given).
Determine the minimum length of the ramp, dz.
MINOR ROAD

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