(A) You are tasked with reporting the speeds for a road to the DOT. The speeds...
(A) You are tasked with reporting the speeds for a road to the DOT. The speeds are shown in the table below, where for example 8 cars had a 30 mph speed, 12 cars a 33 mph speed, etc.
| Speed | Count |
| 30 mph | 8 |
| 33 mph | 12 |
| 40 mph | 17 |
| 42 mph | 4 |
| 45 mph | 9 |
What is the time-mean speed and space-mean speed for this traffic stream?
(B) You notice that 53% of the headways are 8 seconds or greater. What is the:
(i) Probability that exactly six vehicles come in the next minute?
(ii) Probability of three or less vehicles coming in the next minute?
(C) A roadway has a free-flow speed of 65 mph. When the road’s density is 120 veh/mi, the average space-mean speed is 45 mph. What is the road’s flow rate when the average space-mean speed is 40 mph?
Homework Answers
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(A) You are tasked with reporting the speeds for a road to the
DOT. The speeds...
Problem 2 Assume you are an observer standing at a point along a three- lane roadway....
Problem 2 Assume you are an observer standing at a point along a three- lane roadway. All vehicles in lane 1 are traveling at 30 mph, all vehicles in lane 2 are traveling at 45 mph, and all vehicles in lane 3 are traveling at 60 mph. There is also a constant spacing of 0.5 miles between vehicles. If you collect spot speed data for all vehicles as they cross your observation point for 30 minutes, what will be the...
3. What are the two microscopic traffic stream parameters? 4. In speed-flow-density relationships, we use which...
3. What are the two microscopic traffic stream parameters? 4. In speed-flow-density relationships, we use which speed? (space mean speed)/ (time mean speed) 5. Time headway is the time difference between bumpers/rear bumpers 6. The speed limit on a highway is set based on 85a percentile speed. True /False 7. You should be able to identify the following basic q-u-k relationships (shape), what's on x and what's on y, and salient points on the curves. of two successive vehicles. Front...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds?...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds? 2. What is the difference between time-mean speed and space-mean speed? 3. How would you observe the speed, flow, and density of a roadway? Using Greenshields, what is the speed of traffic if the free flow speed is 70 miles per hour, the current density is 70 vehicles per mile, and the jam density is 70 vehicles per mile? 4. What is the speed...
Suppose the speeds of cars along a stretch of I-40 is normally distributed with a mean...
Suppose the speeds of cars along a stretch of I-40 is normally distributed with a mean of 70 mph and standard deviation of 8 mph. What would be the speed for a car whose z-score is z=−1.6? f a car is chosen at random on this stretch of highway, what is the probability it will be travelling at a speed below 70 mph? If a car is chosen at random on this stretch of highway, what is the probability it...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented by the Greenburg Model as the data in Table 3.1. Due to the roadwork on this highway, the width of both traffic lanes is narrowed and a bottleneck to traffic flow forms. The maximum flow on the unobstructed highway is 5000 vehicles per hour whilst on the section under repair the maximum flow is 4000 vehicles per hour. When the traffic flow approaching the...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 n...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 near Grand Island, NE. The following results were recorded. Position from start of road section Vehicle 2000 2300 1700 1200 600 2940 3200 2400 2100 1730 1000 2 3 4 Plot the trajectories of the vehicles on graph paper and compute the average flow (vph), density (veh/mi) and space mean speed (mph) over the 3000 ft length of the lane.
3. (20 pts)...
I need help with - Are there any outliers? - thank you! Ramp metering is a...
I need help with - Are there any outliers? - thank you! Ramp metering is a traffic engineering idea that requires cars entering a freeway to stop for a certain period of time before joining the traffic flow. The theory is that ramp metering controls the number of cars on the freeway and the number of cars accessing the freeway, resulting in a freer flow of cars, which ultimately results in faster travel times. To test whether ramp metering is...
Mr. Big, the Pres asks you, "As a graduate of a TM (Transportation Management) class with an "A",...
Mr. Big, the Pres asks you, "As a graduate of a TM (Transportation Management) class with an "A", what do you think about setting the speed for our tractors?" Give a written answer. Speed dlerences mean more interacuions hat could cause accidents,researcher says By LYNDON FINNEY Citing primarily safety issues, the American Trucking Associations last month petitioned the National Highway Traffic Safety Admin- istration to limit the maximum speed of large trucks at the time of manufacture to no more...
1. The United States Department of Agriculture (USDA), in conjunction with the Forest Service, publishes information...
1. The United States Department of Agriculture (USDA), in conjunction with the Forest Service, publishes information to assist companies in estimating the cost of building a temporary road for such activities as a timber sale. Such roads are generally built for one or two seasons of use for limited traffic and are designed with the goal of reestablishing vegetative cover on the roadway and adjacent disturbed area within ten years after the termination of the contract, permit, or lease. The...
I need help at the very bottom - Choose the correct conclusion. - Thank You! Ramp...
I need help at the very bottom - Choose the correct conclusion. - Thank You! Ramp metering is a traffic engineering idea that requires cars entering a freeway to stop for a certain period of time before joining the traffic flow. The theory is that ramp metering controls the number of cars on the freeway and the number of cars accessing the freeway, resulting in a freer flow of cars, which ultimately results in faster travel times. To test whether...
Problem 2 Assume you are an observer standing at a point along a three- lane roadway. All vehicles in lane 1 are traveling at 30 mph, all vehicles in lane 2 are traveling at 45 mph, and all vehicles in lane 3 are traveling at 60 mph. There is also a constant spacing of 0.5 miles between vehicles. If you collect spot speed data for all vehicles as they cross your observation point for 30 minutes, what will be the...
3. What are the two microscopic traffic stream parameters? 4. In speed-flow-density relationships, we use which speed? (space mean speed)/ (time mean speed) 5. Time headway is the time difference between bumpers/rear bumpers 6. The speed limit on a highway is set based on 85a percentile speed. True /False 7. You should be able to identify the following basic q-u-k relationships (shape), what's on x and what's on y, and salient points on the curves. of two successive vehicles. Front...
1. What is the flow rate if the average headway between 100 vehicles is 5 seconds? 2. What is the difference between time-mean speed and space-mean speed? 3. How would you observe the speed, flow, and density of a roadway? Using Greenshields, what is the speed of traffic if the free flow speed is 70 miles per hour, the current density is 70 vehicles per mile, and the jam density is 70 vehicles per mile? 4. What is the speed...
QUESTION THREE On an urban highway, the relationship between vehicle speed and density can be represented by the Greenburg Model as the data in Table 3.1. Due to the roadwork on this highway, the width of both traffic lanes is narrowed and a bottleneck to traffic flow forms. The maximum flow on the unobstructed highway is 5000 vehicles per hour whilst on the section under repair the maximum flow is 4000 vehicles per hour. When the traffic flow approaching the...
3. (20 pts) Two aerial photographs were taken 30 seconds apart over one east-bound lane of l-80 near Grand Island, NE. The following results were recorded. Position from start of road section Vehicle 2000 2300 1700 1200 600 2940 3200 2400 2100 1730 1000 2 3 4 Plot the trajectories of the vehicles on graph paper and compute the average flow (vph), density (veh/mi) and space mean speed (mph) over the 3000 ft length of the lane.
3. (20 pts)...
Mr. Big, the Pres asks you, "As a graduate of a TM (Transportation Management) class with an "A", what do you think about setting the speed for our tractors?" Give a written answer. Speed dlerences mean more interacuions hat could cause accidents,researcher says By LYNDON FINNEY Citing primarily safety issues, the American Trucking Associations last month petitioned the National Highway Traffic Safety Admin- istration to limit the maximum speed of large trucks at the time of manufacture to no more...
1. The United States Department of Agriculture (USDA), in conjunction with the Forest Service, publishes information to assist companies in estimating the cost of building a temporary road for such activities as a timber sale. Such roads are generally built for one or two seasons of use for limited traffic and are designed with the goal of reestablishing vegetative cover on the roadway and adjacent disturbed area within ten years after the termination of the contract, permit, or lease. The...
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