1. A motorist travelling at 104 KPH on an expressway intends to leave the expressway using an exit ramp with a maximum speed of 56KPH. At what point on the expressway should the motorist step on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp, if this section of the expressway has a downgrade of 3% ? Acceleration is 3.4m/s².
1. A motorist travelling at 104 KPH on an expressway intends to leave the expressway using an exit ramp with a maximum speed of 56KPH. At what point on the expressway should the motorist step on her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering the ramp, if this section of the expressway has a downgrade of 3% ? Acceleration is 3.4m/s².
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:1. A motorist travelling at 104 KPH on an expressway intends to leave the expressway using an exit
ramp with a maximum speed of 56KPH. At what point on the expressway should the motorist step on
her brakes in order to reduce her speed to the maximum allowable on the ramp just before entering
the ramp, if this section of the expressway has a downgrade of 3%? Acceleration is 3.4m/s².
Two cars are approaching each other from the opposite directions at a speed of 120KPH and 90 KPH
respectively. Assuming a reaction time of 2.0 seconds and coefficient of friction of 0.60 with a brake
efficiency of 50%. Compute the minimum sight distance required to avoid a head on collision of the
two cars. (HINT: Sight Distance to Avoid Collision = SSD car 1 + SSD Car 2)
2.
3. A car moving at 80kph on a level road suddenly sees an obstruction 76 m. ahead. If the perception
time is 0.5 sec. and the coefficient of friction between the tires and the pavement is 0.4., how far
from the obstruction will it stop?
4. A test vehicle moving 40 kph was stopped by applying the brakes and the length of the skid mark
12.2m. If the average skid resistance of the level pavement is 0.70, determine the brake efficiency of
the test vehicle. (HINT: Efficiency (%) =f/fave. skid)
5. A test driver's perception-reaction time is being conducted on a special testing track with wet
pavement and a driving speed of 50 kph. When the driver is sober, a stop can be made just in time to
avoid hitting the object that is visible 40m. ahead. After a few drinks of San Miguel beer, under
exactly the same condition, the driver fails to stop in time and strikes the object at speed of 30 kph.
Determine the driver's perception-reaction time after he was drinking. Assume coefficient of friction
is 0.6.
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