7- Consider a network that includes a control station and four coverage stations. Find the 12-hour vehicle volume at each of the coverage stations based on the multiple-day observed number of vehicles at the control station and partial observed number of axels at the control stations that are provided in below tables. Note that a side-survey demonstrates that the average number of axels per vehicle is 2.5 for vehicles traveling in this network. Number of observed VEHICLES at the Control Station Time of Day Day 2:00 PM -8:00 PM 3,000 5,000 8:00 AM -2:00 PM Monday Wednesday 7,000 5,000 Number of observed AXELS at Coverage Stations Time Axel Counts Day Monday Coverage Station 8:00 AM -1:45 PM 5,000 2:00 PM -7:30 PM 10,000 Monday Wednesday Wednesday 6,000 4,000 3 8:00 AM -2:30 PM 4 2:00 PM -7:45 PM

7- Consider a network that includes a control station and four coverage stations. Find the 12-hour vehicle volume at each of the coverage stations based on the multiple-day observed number of vehicles at the control station and partial observed number of axels at the control stations that are provided in below tables. Note that a side-survey demonstrates that the average number of axels per vehicle is 2.5 for vehicles traveling in this network. Number of observed VEHICLES at the Control Station Time of Day Day 2:00 PM -8:00 PM 3,000 5,000 8:00 AM -2:00 PM Monday Wednesday 7,000 5,000 Number of observed AXELS at Coverage Stations Time Axel Counts Day Monday Coverage Station 8:00 AM -1:45 PM 5,000 2:00 PM -7:30 PM 10,000 Monday Wednesday Wednesday 6,000 4,000 3 8:00 AM -2:30 PM 4 2:00 PM -7:45 PM

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter4: Traffic Engineering Studies

Section: Chapter Questions

Problem 21P

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A certain road section has 3 lanes per direction. The result of a survey that was conducted to get the Peak Hour Volume from 5pm - 8pm, is given below. Determine the level of Service (LOS) using the tables below: 5:00-5:15 5:15-5:30 5:30-5:45 5:45 - 6:00 6:00 - 6:15 6:15-6:30 6:30- 6:45 6:45-7:00 7:00-7:15 7:15-7:30 7:30 - 7:45 7:45-8:00 8:00-8:15 8:15-8:30 8:30- 8:45 8:45-9:00 PCEF Types of Highway 2-lane Multi-lane (per lane) Level of Service Cars 15 95 69 95 10 89 47 56 68 12 100 15 F Source: DPWH Highway Planning Manual 19 69 36 69 Cars 1 0.21 -0.50 0.51 -0.70 0.71 0.85 0.86 - 1.00 greater than 1.0 Traffic Volume Trucks 77 Possible capacity (pcu/hr) 2000 2000 Table S: LOS for road section evaluation Volume / Capacity Ratio less than 0.20 18 25 86 15 2 91 26 59 2 57 92 40 14 15 79 Trucks 2.5 Bus 16 77 58 55 3 49 38 85 24 79 38 59 Description free flow traffic free flow traffic moderate traffic 56 33 83 73 Bus 1.5 *PCEF = Passenger Car Equivalent Factor; this will convert your…
7. The following table shows traffic flow data collected at the main road in an urban area, in two successive days during the peak period Day one Flow (veh) Day two Time Flow (veh) 7:30 – 7:45 7:45 – 8:00 900 950 960 8:00 – 8:15 1010 1015 8:15 – 8:30 990 980 (a) Determine the peak hour factor (PHF) (b) Estimate the missing traffic flow count (x) on day two.
Data collected at a parking lot indicate that a total of 300 cars park between 8 a.m. and 5 p.m. 5% of these cars are parked for an average of 2 hr, 20% for an average of 3 hr, 10% for an average of 4 hr, and the remaining cars are parked for an average of 9 hr. (a) Determine the space-hours of demand at the lot. (b) If 10% of the parking bays are vacant on average (between 8 a.m. and 5 p.m.) at the parking lot, determine the number of parking bays in the parking lot. Assume an efficiency factor of 0.90. (c) The owner of the parking lot is planning an expansion of her lot to provide adequate demand for the following 10 years. If she has estimated that parking demand for all categories will increase by 3% a year, determine the number of additional parking bays that will be required.
7. The following are the tabulation of the coverage count of the average daily traffic on a monthly and weekly basis made with automatic traffic counts on a highway. Use the tables to calculate;(a) the ADT for February and October based on 2 days counts: (i) on Tuesday in February the daily counts were 250 vehicles and (ii) on Friday in October, the daily traffic volume was 300 vehicles. (b) the AADT if the flows counted on Friday, Saturday and Sunday in July were 8000, 6000 and 5000 vehicles on a 16 hourly count basis.(c) the seven day 16 hourly flow in September.
4-14 Table 4.10 shows data obtained in a travel time study on a section of highway using the moving-vehicle technique. Estimate (a) the travel time and (b) the volume in each direction at this section of the highway. Chapter 4 Traffic Engineering Studies 149 Table 4.10 Travel Time Data for Problem 4-14 No. of No. of No. of Vehicles Vehicles That Vehicles Run Travel Traveling in Орposite Overtook Overtaken by Test Vehicle Direction/ Time Test Number (min) Direction Vehicle Northward 5.25 100 2 2 2 5.08 105 2 1 3 5.30 103 3 1 4 5.15 110 1 5.00 101 6. 5.51 98 7 5.38 97 1 1 8 5.41 112 2 3 5.12 109 3 1 10 5.31 107 Southward 1 4.95 85 1 2 4.85 88 1 3 5.00 95 1 4 4.91 100 2 1 4.63 102 1 5.11 90 1 1 7 4.83 95 8 4.91 96 3 1 9 4.95 98 1 2 10 4.83 90 1
5-4.. The following traffic count data were taken from a per- manent detector location on a major state highway. 1. 2. 3. 4. 5. Month No. of Total Total Total Weekdays Days in Monthly Weekday Volume in Month Month Volume (days) (days) (vehs) (vehs) 200,000 210,000 215,000 205,000 195,000 193,000 180,000 175,000 189,000 170,000 171,000 Jan 22 31 Feb 20 28 185,000 180,000: 172,000 168,000 160,000 150,000 -175,000 178,000 182,000 176,000 Mar 22 31 30 Apr May Jun 22 21 31 22 30 Jul 23 31 21 31 Aug Sep Oct 22 30 198,000 205,000 200,000 22 31 Nov 21 30 Dec 22 31 From this data, determine (a) the AADT, (b) the ADT for each month, (c) the AAWT, and (d) the AWT for each month. From this information, what can be dis- cerned about the character of the facility and the demand it serves?
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. Calculate: b. What is the % lane occupancy?
6-20 The table below gives data on accepted and rejected gaps of vehicles on the minor road of an unsignalized intersection. If the arrival of major road vehicles can be described by the Poisson distribution, and the peak hour volume is 1100 veh/h, deter- mine the expected number of accepted gaps that will be available for minor road vehi- cles during the peak hour. Number of Accepted Gaps >t Number of Gap (t) (s) Rejected Gaps >t 1.5 92 3 2.5 52 18 3.5 30 35 4.5 10 62 5.5 100
1. A total of 5,000 person-trips are made between a commercial district and a residential area during the PM peak hour. Commuters have two modes available, including private automobile and a light- rail transit system. The following utility function was calibrated using data from the study area from users of these two modes: U 3D -0. 50T1 — 0. 50T, — 2. 00С Data summarizing the operational characteristics and costs associated with each mode are provided in the following table. Private Light-Rail Parameter Automobile Transit = in-vehicle travel time (min.) 10 T1 T2 = excess time (min.) C = out-of-pocket cost (dollars) 15 5 10 5.00 2.00 Determine how many trips will be made by each travel mode based on these characteristics.
A 12 ft long loop detector has observed six vehicles that have crossed the device in a 148 second period, for the following durations: 0.44; 0.48; 0.5; 0.41; 0.49; and 0.55. The six vehicles are 18, 21, 20, 23, 17 and 19 ft respectively. a. How long is the total time for the detector to be occupied? b. What is the % lane occupancy? c. How many vehicles per mile density value, k? d. How many miles per hour is the rated speed, v? e. How many vehicles per hour current value, q?
At a specified point on a highway, vehicles are known to arrive according to a Poissonprocess. Vehicles are counted in 30-second intervals, and vehicle counts are taken in 120 ofthese time intervals. It is noted that no cars arrive in 18 of these 120 intervals. a) Approximate the number of these 120 intervals in which exactly three cars arrive. b) Estimate the Percentage of time headways that will be 10 seconds or greater andthose that will be less than 6 seconds.
count period. n, 5, A 24-hour count using a road tube at a rural highway location produces a count of I1,250 actuations. A repre- sentative sample count to classify vehicles resulted in the data shown here: en Data for Problem 2 Number of Axles Per Vehicle Number Observed 157 55 50 33 8. ---«n 1EK 8 TRAFFIC DATA C Based on this sample classification count, how many vehicles were observed during the 24-hour study? 2344 6