Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 6, Problem 22P
To determine
The phenomenon of gap acceptance with respect to merging and weaving maneuvers in traffic streams.
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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
1. The rate flow at a point in the highway is 1200 vehicles/hour. Find the space mean speed in mph if the density of traffic is 25 vehicles per mile
2. Assume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic speed in kilometer/hour
QUESTION 8
If the free flow speed of the highway is measured in the field, you apply adjustments for lane width, total lateral
clearance, type of median, and access density to estimate free flow speed.
O True
False
Chapter 6 Solutions
Traffic and Highway Engineering
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 - The arrival times of vehicles at the ticket gate...Ch. 6 - Prob. 27P
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- Assume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic speed in kilometer/hourarrow_forwardBased on a field traffic study, the flow-density relationship for a minor arterial street was found as Q= 44 D - 0.6 D2, then the density at .traffic jam condition is about . Veh./km 34 .a 53 .b 73 111 .d None .e C.arrow_forward0-1 A section of highway having a length 60 m. The observed data are 6 vehicles cross over it in a period of 148 sec., for the following duration: 2.4, 2.8, 3.0, 2.1, 2.2. and 3.5 sec. Estimate the values of the flow rate, density, space-mean speed, time-mean speed, average gap, and average clearance. If the length of vehicles are 6, 5.4, 6.6, 4.8, 7.5, and 6 m respectively? 0-2 Traffic volume data has been collected for 10 min time intervals as shown below. Find the total hourly volume, flow rate and PHF. Time 7:30-7:40 7:40-7:50 7:50-8:00 8:00-8:10 8:10-8:20 8:20-8:30 Volume 250 280 300 200 150 130 0-3|| A vehicle takes 1.5 hr to travers a distance of 90 km between two cities. Calculate the journey speed and operational delay if you know that the running speed of this vehicle exceeds it journey speed by 10 km/hr ?arrow_forward
- 4. When the accident rate (instead of accident number) is used to identify hazardous location, there is bias towards selecting low-flow locations with few accidents. A. True B. False 5. If all cars on one lane move at 25 mph and all cars on the second lane move at 30 mph, the time mean speed and space mean speed calculated for the 2-lane highway will be the same: Α. True B. False 6. Free-flow speed is the speed at maximum vehicle flow rate for the Greenshield's speed- density relationship: Α. True B. Falsearrow_forwardIn a given traffic data, determine the Q-k derived equation model using the Greenberg's Traffic flow model and show, draw the plotted modelled points within the curve in a Q-k diagram. Given Traffic Data: Speed in kph 11.5 49.8 15.2 31.3 77.6 Density in veh/km 125.5 93.2 41.8 36.6 39.6arrow_forwardIn the typical curve of flow-density relationship, the traffic condition(s) where traffic :flow nearly zero occurs at Both (empty street & jam density) at capacity .b None .C empty street .d jam density .earrow_forward
- Traffic on a freeway gives a Greenshield's flow relationship expressed as: Q = 65k-0.354k2 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 60 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 area 4. Traffic shockwave line as plotted and shown in the Q-k traffic model diagramarrow_forwardTraffic on a freeway gives a Greenshield's flow relationship expressed as: Q = 65k-0.354k2 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 60 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 area 4. Traffic shockwave line as plotted and shown in the Q-k traffic model diagram Note: Show full solution. Do not copy in chegg it has different question Topic: Highway Engineering (Greenshield Model)arrow_forwardAssume you are observing traffic in a single lane of McArthur Highway at a specific location. You measure the average headway and average spacing of the vehicles as 3.2sec. and 50 m. respectively. Determine the traffic flow in vehicle/hour.arrow_forward
- Problem-5 b, What is the theoretical capacity (in vehicle/hour/lane) of a traffic lane with one way traffic flow at a stream speed of 50 kmph? wwww [Assume the average space gap between vehicles to follow the relation Sg = 0.278 V.t. where 'V' is the stream speed in kmph, 't' is the average reaction time = 0.7 sec, average length of vehicles = 5.0 m]arrow_forwardBy assuming a linear speed-density relationship, the mean free speed on a highway facility lane equals 55 mph near zero density, and the jam density is observed to be about 170 veh/mi. Write down the speed-density and flow-density equations. Plot the q-v curves in proper order. Compute speeds and densities corresponding to a flow of 900 veh/hr, describing traffic conditions from a driver's point of view. Calculate average headways, gaps, clearance, and spacing at maximum flow and at jam density. Discuss all the results you obtain. Are they realistic?arrow_forwardProblem-5 b, What is the theoretical capacity (in vehicle/hour/lane) of a traffic lane with one way traffic flow at a stream speed of 50 kmph? [Assume the average space gap between vehicles to follow the relation Sg = 0.278 V.t. where 'V' is the stream speed in kmph, 't' is the average reaction time = 0.7 sec, average length of vehicles = 5.0 m]arrow_forward
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