Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Question
Chapter 12, Problem 17P
To determine
The estimation of lumber flows between the three states.
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Compute for the Total Remaining Traffic *
A.15,858 vehicles
B.15,743 vehicles
C.15,862 vehicles
D.15,750 vehicles
E.None of the above
a) Table 4 indicates an urban zone’s expected household composition at some future year
and the calibrated educational-based trip rates. Estimate the total educational-based trips
in terms of "y" that the urban zone will produce on a typical day in the horizon year.
(A
Table 4: Household composition and trip generation rates
Number of motor
vehicles per household
Number of persons per household
1
2793
1.7y
4
5+
2046
H.
344
2472
3092
R
0.8y
2.Зу
717
3.1x
2.4y
1022
3.1x
2.4y
726
2+
H
294
2.1x
R
1.6x
3.3х
H= Number of households in category
R= Educational trip production rate (per household) in category
x-0.5y
The daily counts of the current traffic volume for a rural highway for one week of May 2000 are
as shown in the following table:
Sat.
Sun.
Mon.
Tues.
Wed.
Thur.
Fri.
Day
Daily volume
12000
12500
10500
11500
9500
9000
8500
The traffic is composed of 70% passenger car, 20% bus, 10% truck. The percent of future traffic
to current traffic is predicted to be 180% up to May 2020. Determine the required number of
lanes for this highway if the lane capacity is 1300 pc/hr.
Chapter 12 Solutions
Traffic and Highway Engineering
Ch. 12 - Prob. 1PCh. 12 - Prob. 2PCh. 12 - Prob. 3PCh. 12 - Prob. 4PCh. 12 - Prob. 5PCh. 12 - Prob. 6PCh. 12 - Prob. 7PCh. 12 - Prob. 8PCh. 12 - Prob. 9PCh. 12 - Given a table with production and attraction data,...
Ch. 12 - Given a table with production and attraction data,...Ch. 12 - Prob. 12PCh. 12 - Prob. 13PCh. 12 - Prob. 14PCh. 12 - Prob. 15PCh. 12 - Prob. 16PCh. 12 - Prob. 17PCh. 12 - Prob. 18PCh. 12 - Prob. 19PCh. 12 - Prob. 20PCh. 12 - Prob. 21PCh. 12 - Prob. 22PCh. 12 - Prob. 23PCh. 12 - Prob. 24PCh. 12 - Prob. 25PCh. 12 - Prob. 26PCh. 12 - Prob. 27PCh. 12 - Prob. 28P
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- There are two paths in the network shown below: The cost functions are given as: T₁ = 8 +0.4X₁ • T₂ = 16+0.9X2 ● 1 Path 1 Path 2 Assume 5 vehicles travelling between points 1 and 2. Determine the UE flow on path 2. Report your answer correct to 2 decimal digits. Answer:arrow_forwardA zone has been divided into four large districts (traffic zones). The following data has been collected for those districts. Provide a trip distribution calculation (single constrained) using the gravity model. Assume Kij = 1 (Check balancing of Tij = A after the first iteration) District 1 2 3 4 Travel Time Fij Productions 3400 6150 3900 2800 1 2.0 Attractions 2800 6500 2550 4400 4 1.6 6 1.0 1 4 11 15 10 9 10 0.9 0.86 Travel time (min) 2 3 11 15 6 6 6 6 9 11 11 12 0.82 0.80 4 10 9 11 4 15 20 0.68 0.49arrow_forwardA small town has been divided into three traffic zones. An origin-destination survey was conducted earlier this year and yielded the number of trips between each zone as shown in the table below. Travel times between zones were also determined. Provide a trip dis- tribution calculation using the gravity model for two iterations. Assume K; = 1. The following table shows the number of productions and attractions in each zone. Zone 1 2 3 Total Productions 250 450 300 1000 Attractions 395 180 425 1000 The survey's results for the zones' travel time in minutes were as follows. Zone 1 3 1 6 4 2 2 8 3 3 1 3 The following table shows travel time versus friction factor. Time (min) 1 2 4 7 8 Friction Factor 82 52 50 41 39 26 20 13 2.arrow_forward
- A bridge has been constructed between the mainland and an island. The total cost (excluding tolls) to travel across the bridge is expressed as C- 50 + 0.5V, where V is the number of veh/hr and Cis the cost/vehicle in cents. The demand for travel across the bridge is V- 2500 - 10C. (a) Determine the volume of traffic across the bridge. (b) If a toll of 25 cents is added, what is the volume across the bridge? What volume would be expected with a 50 cent increase? 155 (c) A tollbooth is to be added, thus reducing the travel time to cross the bridge. The new cost function is C- 50 + 0.2V. Determine the volume of traffic that would cross the bridge. (d) Determine the toll to yield the highest revenue for demand and supply function in part (a), and the associated demand and revenuearrow_forwardThree routes connect an origin to a destination with the following link performance functions: t_1 = 8 + 0.5 x_2 t_2 = 1 + 2x_2 t_3 = 3 + 0.75x_3 where t's in minutes and x's in thousands of vehicle per hour. If the peak-hour traffic demand is 4000 vehicles, determine the user equilibrium (UE) flows.arrow_forward3. Three routes connect an origin-destination pair with performance functions: ti=20 +0.51 t₂ = 4+2x2 tε = 3 +0.2x² with t in minutes and r in thousand vehicles per hour. (a) Determine the User Equilibrium flow on each route if q = 4000veh/h. (b) What is the minimum q (origin-destination demand) to ensure that all the three routes are used under user equilibrium? (c) Suppose that Route 1 is closed for repair. Find the system optimal flow on routes 2 and 3 and compute the total travel times.arrow_forward
- A small town has been divided into three traffic zones. An origin-destination survey was conducted earlier this year and yielded the number of trips between each zone as shown in the table below. Travel times between zones were also determined. Provide a trip dis- tribution calculation using the gravity model for two iterations. Assume K,= 1. The following table shows the number of productions and attractions in each zone. 3. Total Zone Productions 250 450 300 1000 Attractions 395 180 425 1000 The survey's results for the zones' travel time in minutes were as follows. Zone 1 1 4 2. 4 8. 3. 3. 3. 5 The following table shows travel time versus friction factor. Time (min) 3 4. 6. 7 8. Friction Factor 82 52 50 41 39 26 20 13arrow_forwardEstimate the daily demand (DD) in (L/day) for a city of 5.2 x 106 persons, if average daily flow = Qave = 225 Lpcd, Maximum Daily Demand = Qmax =1.8 Qave: %3D Select one: O a. 117000000 L/day O b. 2270000000 L/day O c. 11700000 L/day O d. 1170000000 L/day Next page er (3) = Water Supply and Jump to... Water Treatment 2)arrow_forwardThe Jeffersonville Transportation Study Area has been divided into four large districts (traffic zones). The following data have been collected for those districts. Provide a trip distribution calculation using the gravity model for two Assume Kij = 1.arrow_forward
- e) Given the household and demographic data presented in Table 1, calculate the total number of AM Peak trips produced and attracted in each of the zones in Springtown (rounded up to the nearest integer). Comment on the validity of the results. Are the values obtained consistent with the land use described in the brief? Clearly justify your response. Table 1: Current zonal household data for Springtown Zones Households Average Household Number of Household Number of Average Average Average Office Retail Space (m²) Space (m2) Income Vehicles size Workers ('000s) Per per Household Household Zone 1 9000 97.2 1.6 2.3 1.8 250000 350000 Zone 2 5000 96.7 0.9 3.3 1.9 80000 10000 Zone 3 6500 74.8 1.1 2.7 1.3 35000 25000 Zone 4 2500 69.5 1.5 2.1 1.5 10000 10000 f) In order to improve the accuracy of the trip production model, you are considering collecting data for another variable related to trip generation. Which variable would you select and why?arrow_forwardA toll bridge carries 6000 vch/day The current toll is $3.50/vehicle. Studies have shown hat for each increase in toll of 50 cents, the traffic volume will decrease by 500 veh/day. Jus desired to increase the toll to a point where revenue will be maximized. (a) Write the expression for travel demand on the bridge, related to toll increase and current volume. (b) Determine the toll charge to maximize revenbes. (o Determine traffic in vel/day after the loll increase, (d) Determine the total revente increase with the new tol.arrow_forwardSuppose that the results of a peak-hour trip generation analysis for a five-zone small urban area is as follows: Trip Productions: P=11,000 P:-93,300 P=12,900 P-203,500 Ps-90,700 person-trips Trip Attractions: A,=135,800 A;-57,500 A,-80,900 A,-72,000 A;-85,200 person-trips Given the following friection factor matrix (based on travel time and cost factors) as follows: Fy Matrix To zone 2 34 0.78 0.44 0.55 0.28 0.28 From Zone 2 0.44 1.30 0.40 0.70 0.33 0.55 0.40 1.30 0.44 0.80 4 0.28 0.70 0.44 1.80 0.44 5 0.28 0.33 0.80 0.44 1.80 Calculate the expected peak-hour trip distribution from zone 2 to zone 5 (T2s =?).arrow_forward
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