Traffic And Highway Engineering
5th Edition
ISBN: 9781133605157
Author: Garber, Nicholas J., Hoel, Lester A.
Publisher: Cengage Learning,
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Question
Chapter 3, Problem 24P
To determine
The minimum distance required for the road sign should be located from the diversion.
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Traffic on a freeway gives a Greenshield's traffic flow relationship expressed as:
Q = 60k-0.16667k?
At 10AM, an accident occurs 4 km downstream of an access ramp. The vehicles pull onto the shoulder of
the roadway, but traffic passing the accident area slows to 10 kph as drivers survey the damage on the side
of the road. A patrol car enters the freeway via access ramp, also at 10AM. Upon entering the freeway, the
patrol car notes that traffic on the freeway is moving along at about 40 kph.
Determine the following:
1. Capacity flow of the highway
2. Traffic shockwave created by the road accident
3. Time in AM the patrol car will reach the accident zone
4. Plotted traffic shockwave line in the Q-k traffic model diagram
Question 4
One stretch of two-lane two-way roadway that traverses through level terrain is expected
to carry 1400 vehicle per hour. Determine the Level of Service (LOS) in the peak
direction for the road based on average travel speed (ATS) if the characteristics of the
roadway are as follows:
Table Q4-1
Percentage of Trucks
Percentage of Recreational Vehicle
Peak Hour Factor
10
0.97
60:40
60
Percent Directional Split
Percent no-passing Zone
Lane Widths
Shoulder Widths
Design Speed
Road Length
Access Points
3.35 m
1.2 m
96 km/h
8 km
10 access points per km
State all assumption (if any) used in calculation..
1- You are assigned to evaluate the level of service for a section of a six-lane rural highway
that stretches along a level terrain with shoulder width of eight ft and lane width of
twelve ft. The average annual daily traffic is fifty-five thousand vehicles per day with ten
percent trucks, five percent buses, and three percent recreational vehicles. The peak hour
factor is 0.80 and the directional split is fifty-fifty. The distance between consequent
interchanges is two miles. Calculate the level of service for this highway section and
show your calculation steps.
Chapter 3 Solutions
Traffic And Highway Engineering
Knowledge Booster
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