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Engineering

Civil Engineering

Calculate harmonic mean for velocity (kmph) data of vehicles moving on an expressway 2 86 04

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter9: Capacity And Level Of Service For Highway Segments

Section: Chapter Questions

Problem 17P

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Question

Civil Engineering - Traffic Engineering
Q1. Calculate harmonic mean for velocity (kmph) data of vehicles moving on an expressway
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- From the traffic studies performed along a street shows the distances each vehicle traveled every 3 seconds on a portion of the highway. Vehicle Distance, m 1 82.6 2 89.9 3 84.6 4 82 a.computethe space mean speed of the traffic, in kph.b.computethe flow of traffic.c.computethe density of traffic.
calculate the space mean
Estimate the maximum number of cars in a single lane of traffic that would pass a check-point in one hour at an average speed of 50 mph. Safe driving practice requires one car length of spacing for each 10 mph speed. (a) Layout the procedure for making the estimation including assumptions, diagrams, equations, etc.
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Problem 2: The following data are taken from 5 vehicles observed from photographs taken 3 seconds apart. Compute the space mean speed, in kph. Vehicles Distance( m) 1 38.4 2. 35.4 3 32.8 4 36.6 37.5
Answer the ff.
1.) REFER TO THE TABLE BELOW TO FIND THE LOWER SPEED LIMIT, HIGHER SPEED LIMIT AND MEDIAN SPEED LIMIT. USE INTERPOLATION AND SHOW DETAILED SOLUTION. ANSW MUST BE: Lower speed limit = 23.8 , Higher speed limit = 35.096, and median speed limit = 29.26667.
Part 2 - Solving: Observers stationed at two sections A-A and B-B, 200 m apart on a highway, record the arrival times of four vehicles as shown in the table. %3 Vehicle Section A-A Section B-B To + 7.6 sec To + 10.4 sec To + 15.1 sec I To + 23.4 sec If the total time of observation at A-A was 20 seconds, determine: (a) the time mean speed in A To + 4.2 sec To + 8.7 sec To + 13.7 seC B C KPH, (b) the space mean speed in KPH, (c) the flow at section A-A in veh/hr, (d) time headway in seconds, and (c) traffic density in veh/km. 5 points each.
The average speed per lane of a vehicle of an expressway is 65 kph. The average length of cars moving on that lane is 5.35 m. The perception, identification, emotion and volition time is 1.2 second What is the required center to center spacing of vehicles in meter? a.26.97 b. 23.65 c. 19.00 d. 29.16 The traffic density in vehicles per kilometer is equal to a.32.44 b. 37.08 c. 29.82 d. 26.97 Calculate the minimum time headway per vehicle in seconds? a.1.12 b. 2.23 c. 1.34 d. 1.62
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Present the solution, and inbix the answer.
2. Figure shows the captured aerial photography showing the locations and speeds of 4 vehicles travelling between section x & y. An observer located at X observes the four(4) vehicles passing pt X during a period of 15 sec. Calculate the following: a) Space Mean Speed b) Time Mean Speed c) Average Spacing d) Headway 60 kph 40 kph 45 kph 55 kph Direction D B A of flow 300m