PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
7th Edition
ISBN: 9781119610526
Author: Mannering
Publisher: WILEY
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Chapter 6, Problem 8P
To determine
The passage cars could be added to original traffic.
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with central reserve the current traffic in 2019 expressed by AADT is 3000
vehicle in both direction. the improved road with design life traffic 20 years
will be opened to traffic in 2024. The estimated annual growth rate of traffic
is 5%.
1000pcu/hr
12% f ADT
60% of total volume
16% of hourly volume
Lane capacity
K
D
Th
Q1-B:1-How are travel time and delay studies used?
The traffic demand for a six-lane urban arterial road (three lanes per direction) is given in the table
below. The relationship between flow and density for this road follows GreenShiled's model, with
a free flow speed of 105 km/h and a jam density of 92 veh/km/lane. Two of the three lanes of the
EB direction were closed at 5:00 AM for maintenance. The two lanes were re-opened at 8:00 AM,
allowing the traffic to be released at capacity conditions.
a) What is the maximum length of the queue upstream of the bottleneck?
b) At what time the queue upstream of the bottleneck will be fully dissipated?
c) What is the furthest point upstream of the bottleneck that will be impacted by the lane
closure?
d) Draw the shock wave diagram showing shock wave speeds, critical times, and distances.
Time
5:00
6:00 AM
6:00 7:00 AM
7:00 8:00 AM
8:00 9:00 AM
9:00 10:00 AM
10:00 11:00 AM
Demand (vph)
2000
4000
6400
6000
3600
3000
4. Three routes connect and origin and a destination with performance functions
t₁ = 8 + x₁, t₂ = 1 + 2x₂, and t3 = 1 + 0.5x3 (with x's in thousands of vehicles per hour
and t's in minutes). If the peak-hour traffic demand is 3400 vehicles, determine user-
equilibrium traffic flows on each route. [Ans: x₂ = 0.68]
Chapter 6 Solutions
PRIN.OF HIGHWAY ENGINEERING&TRAFFIC ANA.
Ch. 6 - Prob. 1PCh. 6 - Prob. 2PCh. 6 - Prob. 3PCh. 6 - Prob. 4PCh. 6 - Prob. 5PCh. 6 - Prob. 6PCh. 6 - Prob. 7PCh. 6 - Prob. 8PCh. 6 - Prob. 9PCh. 6 - Prob. 10P
Ch. 6 - Prob. 11PCh. 6 - Prob. 12PCh. 6 - Prob. 13PCh. 6 - Prob. 14PCh. 6 - Prob. 15PCh. 6 - Prob. 16PCh. 6 - Prob. 17PCh. 6 - Prob. 18PCh. 6 - Prob. 19PCh. 6 - Prob. 20PCh. 6 - Prob. 21PCh. 6 - Prob. 22PCh. 6 - Prob. 23PCh. 6 - Prob. 24PCh. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Prob. 27PCh. 6 - Prob. 28PCh. 6 - Prob. 29PCh. 6 - Prob. 30PCh. 6 - Prob. 31PCh. 6 - Prob. 32PCh. 6 - Prob. 33PCh. 6 - Prob. 34PCh. 6 - Prob. 35PCh. 6 - Prob. 36PCh. 6 - Prob. 37P
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- A portion of the extension of SLEX has a free flow speed of 60kph and a capacity of 3600 veh/hr. If in a given hour, 3344 vehicles were countered at a specified point along this highway, determine the traffic density of these 3344 vehicles.arrow_forwardYou are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88, and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least LOS D using the 30th highest annual hourly volume (K30 = 0.12). The answer is a/an -lane freeway.arrow_forwardThe traffic from a suburban area to a city uses the following five shorter routes, as shown below. Access from Suburban Route 4 Route 1 Route 5 Route 2 Route 3 Access to City The models below show the travel time as a function of traffic flow on each route. t₁ = 18 + 4.5 x₁ t₂ = 21+ 7.0 x₂ t3 = 26 + 4.9 x3 t4 = 29+ 3.4 x4 t5 = 34 + 0.3 x5 Where: t; is travel time on route 'i' (in minutes) and x; is traffic flow on route 'i' (in 1000 vehicles).arrow_forward
- You are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88, and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least LOS D using the 60th highest annual hourly volume (K60 = 0.11). The answer is a/an -ane freeway.arrow_forwardA section of highway has a linear speed-density relationship. The capacity of the roadway is 3,751 veh/hr and this capacity is observed at an average speed of 40 mi/hr. What speed is observed when traffic is congested with a flow of 1,053 veh/hr?arrow_forwardYou are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88, and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least LOS C using the 40th highest annual hourly volume (K = 0.116). A 6 B) 4 c) 10 D) 8arrow_forward
- You are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88, and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least LOS C using the 40th highest annual hourly volume (K = 0.116).arrow_forwardA freeway is being designed for a location in mountainous terrain. The expected free-flow speed is 55 mi/h. Lane widths will be 12 ft and shoulder widths will be 6 ft. During the peak hour, it is expected there will be a directional peak-hour volume of 2700 vehicles, 12% large trucks and buses and 6% recreational vehicles. The PHF and driver population adjustment are expected to be 0.88 and 0.90, respectively. If a level of service no worse than D is desired, determine the necessary number of lanes.arrow_forwardAn existing 6-lane (3-lanes in each direction) divided multilane highway with a free flow speed of 45 mph has expected peak hourly volumes of 4000 vph, with 15% trucks, and no buses or RVs. The PHF is 0.90. The highway in question is in generally rolling terrain. a. Find the traffic flow rate in units of vph b. Find the heavy vehicle factor in veh/pc c. Find the demand flow rate in units of pcphplarrow_forward
- You are designing a freeway as a passenger-car-only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75,000 vehicles per day, a peak-hour factor of 0.88, and a directional distribution of 0.65. day. It is estimated that the freeway will have a free flow speed of 70mi/h. Determine the number of lanes (both directions) required to provide at least LOS D using the 60th highest annual hourly volume. Use k =0.11.arrow_forwardYou are designing a freeway as a passenger-car only facility, and with ideal roadway characteristics. It is estimated that the freeway will have a traffic demand of 75.000 vehicles per day, a free-flow speed of 70 mi/h, a traffic stream of primarily commuters, a peak-hour factor of 0.88 and a directional distribution of 0.65. Determine the number of lanes (both directions) required to provide at least level of service D using the 30th highest annual hourly volume (K30+ 0.12). The answer is a number of lane freeway.arrow_forwardA segment of rural freeway is being designed for a FFS of 70 mph through rolling terrain. The directional (i.e. one-way) design volume is 3,000 vehicles per hour. If 10% of the design volume is expected to be heavy vehicles (i.e. trucks and buses), what is the heavy vehicle adjustment used to determine the flow rate? Provide you answer to the nearest hundredths.arrow_forward
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