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 A of flow

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 A of flow

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter10: Capacity And Level Of Service At Signalized Intersections

Section: Chapter Questions

Problem 3P

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Observers stationed at two sections XX and YY, 1000 ft apart on a highway, record the arrival times of four vehicles as shown in the table below. Vehicle Section XX Section YY A T0 T0 + 14.33 sec B T0 + 3.76 sec T0 + 18.14 sec C T0 + 7.94 sec T0 + 22.06 sec D T0 + 12.13 sec T0 + 27.87 sec If the total time of observation at XX was 20 sec, determine (a) the time mean speed, (b) the space mean speed, (c) the flow at section XX, and (d) the density on the highway
Compute the minimum passing sight distance for the following data: Speed of the passing car = 96 kphSpeed of the overtaken vehicle = 80 kphTime of initial maneuver = 4 secsAverage acceleration = 2.4 kph/secTime passing vehicle occupies the left lane = 9 secsTime the passing vehicle meets the vehicle originally occupying the left lane = 6 sec
Transportation Engineering Roll No. - 69 do the numerical part 2. Explain with the help of sketches various types of highway intersections. The 15 minute design traffic volume on cross road 1 and 2 during peak hour are observed as 180+R.No. and 150+R.No. vehicles per lane respectively. If the amber times required are 4 and 3 seconds respectively for two roads, design the signal timing by trial cycle (or exact) method. Assume average time headway of 2.5 sec during green phase. CO3
Draw the diagram and compute the passing sight distance for the following data:Speed of the passing car = 96 kphSpeed of the overtaken vehicle = 88 kphTine of initial maneuver = 4.3 secAverage acceleration = 2.37 kph/secTime passing vehicle occupies the left lane = 10.4 secDistance between the passing vehicle at the end of its maneuver and the opposing vehicle = 76 m
Question (1) Traffic Volume on a four lane freeway (two lanes in each direction) were counted manually from an overhead location resulting in the data shown belowTime of count Eastbound westboundLane 1 Lane 2 Lane 1 Lane 24:00-4:15 360 3104:16-4:30 350 285 4:30-4:45 380 3304:46-5:00 370 300 5:01-5:15 370 3405:16-5:30 345 280 5:31-5:45 340 3105:46-6:00 320 260 a) The peak hour factor for each direction and each lane.b) The design hourly volume for each direction and each lane.
PROBLEM 6: Four vehicles passing through the SLEX has the following observation. Determine the time mean speed. Vehicles Time of passing (sec) | Spot speed (kph) 1 1.5 55.4 2 6.0 56.8 3 8.0 53.6 4 12.00 48.9
Q-3 A_ A vehicle traveled from city A to city B With average speed 120 km/hr, In the same time another vehicle traveled from city B to city A With average speed 90 km/hr,where and when the two vehicle will be connect if the distance between A and B 200 Km?
COMPUTE THE MINUMUM PASSING SIGHT DISTANCE FOR THE FOLLOWING DATA: SPEED OF THE PASSING CAR = 90 KPH SPEED OF THE OVERTAKEN VEHICLE = 80 KPH TIME OF INITIAL MANEUVER = 4 SEC AVERAGE ACCELERATION = 2.4 KPH/SEC TIME PASSING VEHICLE OCCUPIES THE LEFT LANE = 9 SEC DISTANCE BETWEEN THE PASSING VEHICLE AT THE END OF ITS MENEUVER AND THE OPPOSING VEHICLE = 80 KPH
QUESTION 1 The approaches of a 4-leg signalized intersection are configured with 1 NB lane, 1 SB lane, 1 EB lane, and 1 WB lane and each of these lanes serves LT, TH, and RT movements. The following volumes and phasing are provided. approach EB WB NB SB movement LT TH RT LT TH RT LT TH RT LT TH RT volume 120 480 160 80 560 100 20 200 40 12 160 48 2 6 What is the critical sum for the EB/WB barrier?
Exercise 6 A three phase signal design is given below. ● ● ● Hic Signal What is the sum of the flow ratios for the critical lane groups? What is the total lost time for a signal cycle assuming 2 seconds of clearance lost time and 2 seconds of startup lost time per phase? What is the cycle length using Webster Method? EB - Phase 1 2 3 -200 20 SB 30 100- Lane group SB NB EB WB 400 1000 NB 150 50 300 30 WB Saturation Flows 3400 veh/hr 3400 veh/hr 1400 veh/hr 1400 veh/hr
Compute the minimum passing sight distance for the following data: Speed of the passing car = 90kph Speed of the overtaken vehicle = 80kph Time of initial maneuver = 4 sec Average acceleration = 2.4 m/sec2 Time the passing vehicle occupies the left lane = 9sec Distance between the passing vehicle at end of its maneuver and the opposing vehicle = 80m
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.