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- Q1 (a) i. 10,000 vehicle speed traffic data were collected during the weekday on route FT050 at Batu Pahat, Johor. Suggest how to quantify and describe the basic characteristic of this data. Then explain how the method you suggested can help others to understand the data. (4 marks) ii. Consider the following data from 11 truck speed data climbing a hilly road. Compute 5 (FIVE) basic statistics of the sample speed as following: Sample mean Median а. b. с. Variance d. Range Standard error of the mean е. Speed (km/h) 25 Truck 1 2 35 3 55 4 15 40 6. 25 7 55 8. 35 9. 45 10 11 20TRAVEL TIME AND DELAY STUDIES • The 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 Run Direction/ Number Northward 2 4 5 6 7 8 9 10 Southward 3 4 6 7 8 9 10 No. of Vehicles Travel Traveling in Time Opposite Direction (min) 5.25 5.08 5.30 5.15 5.00 5.51 5.38 5.41 5.12 5.31 4.95 4.85 5.00 4.91 4.63 5.11 4.83 4.91 4.95 4.83 100 105 103 110 101 98 97 112 109 107 85 88 95 100 102 90 95 96 98 90 PARKING STUDIES No. of Vehicles That Overtook Test Vehicle 3 1 0 1 3 0 1 0 0 2 1 1 No. of Vehicles Overtaken by Test Vehicle 2 1 1 0 3 1 0 1 2 PROB 1. Data collected at a parking lot indicate that a total of 300 cars park between 8 a.m. and 6 p.m. 10% of these cars are parked for an average of 2 hr, 30% for an average of 4 hr, and the remaining cars are parked for an average of 10 hr. Determine the space-hours of demand at the lot PROB 2. If 10% of…5. 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, determine the expected number of accepted gaps that will be available for minor road vehicles during the peak hour. Number of Rejected Gaps > t Number of Accepted Gaps >t Gap (t) (s) 1.5 92 3 2.5 52 18 3.5 30 35 4.5 10 62 5.5 2 100
- 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 1road construction The 20-year projection of annual average daily traffic of a two-way roadway is 36.500 vehicles. Theroad serves as a highway between a residential area and a business area and the expected directionaldistribution factor is D=0.6. The 30th peak hour factor for the roadway is K=0.15. During an hourly vehiclecount, the following values were registered: 1st 15 minutes: 200 cars, 2nd 15 minutes: 130 cars, 3rd 15minute 230 cars, 4th 15 minutes. 180 cars. Estimate the peak hour factor . What is the designdirectional hourly volume for this route?Use 2 decimal places in your final 4. Route 1 has a free flow travel time of 10 minutes and the average travel time on this route increases by 3 minutes for every vehicle increase and Route 2 has a free flow travel time of 15 minutes and its average travel time increases by 2 minutes for every vehicle increase. Compare the results for UE and SO conditions with a flow rate is 12 veh/hr, determine the ff: Travel times on each route Traffic volumes on each route Total system travel time ■
- d. Different types of traffic counts are carried out, depending on the data's anticipated use to be collected. Select and describe the method and equipment you will recommend for traffic volume counts for each road below. Give reasons for your recommendations. 1. A private road leading to an industrial development 2. A residential street 3. A rural collector road 4. A section of an interstate highwayMake a cumulative vehicle diagram and queue accumulation polygon based on the following field data collected from an approach at a signalized intersection, namely: 1. Cycle length = 72 seconds 2. Red interval = 30 seconds 3. Green interval = 42 seconds 4. Vehicle arival flow = 900 vehicles/hour %3D %3D 5. Saturation flow rate = 1800 vehicles/hour 6. Vehicle departures every 2 secondsSituation III: The table below shows the reported accidents for 1 10-mile highway section of the Macapagal boulevard. Year Ave. daily Traffic 20,500 22,000 23,500 24,000 25,500 7. Compute for the severity ratio Property damage 165 Injury Accidents Fatal Accidents 2000 40 2001 150 45 2002 170 170 50 10 2003 45 2004 160 60 19 8. Compute for the accident rate for injury accidents in HMVM 9. Compute the accident rate in HMVM O69
- Example - Floating car method The data collected from speed and delay studies by floating car method on a stretch of urban road of length 3.5 km, running North-South are given below. Determine the average values of volume, journey speed and running speed & SMS of the traffic stream along either direction. Trip Direction of Journey trip time No. 1234S00 5 6 7 8 N-S S-N N-S S-N N-S S-N N-S S-N Total stop No. of delay vehicles Min-Sec Min-Sec overtaking 6-32 7-14 6-5 7-40 6-10 8-00 6-28 7-30 1-40 1-50 1-30 2-00 1-10 2-22 1-40 1-40 4552 M N N M 3 2 2 3 No. of vehicle overtaken 733L5252 1 No. of vehicles from opposite direction 268 186 280 200 250 170 290 160At 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.Question 2 Because the new travel time rate (TTR) from the additional traffic (e.g., 300vph) exceeds the minimum acceptable local standard of 2.0 min/mile, it is proposed to increase the road capacity by 900vph/lane by adding one lane in each direction. Calculate the new travel time rate and traffic volume using: a. The traditional method of traffic impact analysis, and b. The above-mentioned pivot point analysis method. c. Compare the results of the two methods and comment on their significance.