The demand function for automobile travel along a major corridor in a medium-sized city is estimated to be Q=aA-22 B0.13 C-0.4 D0.75 where Q = automobile trips per hour (peak-hour) a = Constant A = Travel time by automobile in minutes B = travel time by bus in minute C = Average cost by automobile D = Average cost by bus (a) Justify the signs (+ or -) of the exponents of parameters A, B, C, and D. (b) Because of congestion likely to occur on this corridor, the travel times of automo- biles would increase by 20%, and travel times of buses would increase 10%. At the same time, auto travel costs rise 5% and bus costs decrease 15%. What will be the percentage change in auto traffic? (c) If the average cost of travel by bus increases by 10%, but the travel time by bus de- creases by 10%, what would be the overall percentage increase or decrease in auto travel?

The demand function for automobile travel along a major corridor in a medium-sized city is estimated to be Q=aA-22 B0.13 C-0.4 D0.75 where Q = automobile trips per hour (peak-hour) a = Constant A = Travel time by automobile in minutes B = travel time by bus in minute C = Average cost by automobile D = Average cost by bus (a) Justify the signs (+ or -) of the exponents of parameters A, B, C, and D. (b) Because of congestion likely to occur on this corridor, the travel times of automo- biles would increase by 20%, and travel times of buses would increase 10%. At the same time, auto travel costs rise 5% and bus costs decrease 15%. What will be the percentage change in auto traffic? (c) If the average cost of travel by bus increases by 10%, but the travel time by bus de- creases by 10%, what would be the overall percentage increase or decrease in auto travel?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter13: Evaluating Transportation Alternatives

Section: Chapter Questions

Problem 9P

See similar textbooks

Similar questions

I want answer in c).
Three routes connect an origin and destination with performance function tj = aj + bjxj/cj (with t's in minutes and x's in thousands of vehicles per hour). If the total origin-to-destination hourly demand is 10,000 vehicles, what is a travel time in minutes (input answer in a form 00,00 minutes). Route 1 Route 2 Route 3 a 13 8 9 b 1.9 2.5 2.1 6. 8 7
ANSWER WITH SOLUTIONS AND TYPEWRITTEN PLEASE
Example: A busy travel corridor connecting a suburb with the city center is served by two routes having a typical travel time function, t =a + b(q/c), where t is the time in minutes, q is the vehicular flow in veh/hr, and c is the capacity of the route in veh/hr. The existing characteristics of the two routes is as follows: Route a b c 1 34 3000 2 4 2 4000 (a) If the existing peak-hour demand is 5000 veh/hr, what is the traffic distribution on the two routes? (b) If repair work on Route 1 reduces its capacity to 2000 veh/hr, what is likely to be the traffic distribution on the two routes for the duration of the repairs? (c) It is anticipated that after the repairs are completed on Route 1, its capacity will be 4200 veh/hr. How will this affect the distribution.
solve and show complete solution. tnx
Transportation Engineering subj. Choices for both are: 0.627 0.513 0.487 0.328 Hope you can help me, I will upvote thanks :)
Give me right solution with clear calculations.
Transportation Engineering (Upvote will be given. Write the solutions legibly. Round-off the Final answer in 2-decimal places. No long explanation needed.)
The performance function for a highway connecting a suburb with the business district can be represented by a straight line of the form t = a + bp, where t is the travel time in minutes, q is the traffic flow in vehicles per hour, and a and b are constants equal to 15 minutes and 0.01 minute/vehicle-hour, respectively. The demand function, also represented by a straight line, is q = c + dt, where c and d are constants equal to 6000 vehicles/hr and vehicles/hour/minute, respectively. (a) Find the equilibrium flow (q*) and the corresponding equilibrium time (t*) algebraically, and sketch the functions. (b) If the length of this highway is 25 miles, what is the average speed of vehicles along this highway? (c) It is proposed to improve this highway such that constant b is now 0.005. What would be the new values of t* and q* and what would be the average speed on this highway?
The following 3 Travel Demand Forecasting models were created to estimate the number of peak-hour trips in the suburb of Croydon: T1 = 1.0 + 0.3(household size) + 0.01(household income in thousands of $) T2 = 1.5 + 0.2(household size) + 0.01(household income in thousands of $) T3 = 0.5 + 0.5(household size) + 0.01(household income in thousands of $) The suburb has a total of 3500 households with an average of 4 people per household, an average household income of $90,000 and survey data shows that it generates a total of 11,550 trips in the peak-hour. Which of the above models is the most accurate? A. T1 B. T2 C. T3 D. Can't say as 2 or more models are equally accurate.
Automobile Transit 0 10 Model Parameter X₁, waiting time (min.) X₂, travel time (min.) X₁. parking time (min.) 20 35 5 0 X4, out-of-pocket cost (cents) 225 100 A. calibration constant -0.33 -0.27 B. After implementing service improvements to the mass transit, the mode split changed to 81.4% private automobile use and 18.6% mass transit use. Determine a value for the waiting time for the mass transit mode that reflects this shift in mode split.
need help.