Table below shows the frequency of each speed collected from a rural highway segment. calculate the 85-percentile speed. Note: The 85-percentile speed is designed as the speed at or below which 85% of the traffic is travelling. Speed (MPH Frequency 1 2 1 1 1 25 28 29 32 33 35 2 36 1 37 39 2 42 1 43 45 5 2 46 47 3 48 1 3 49 50 51 2 52 53 2 54 1 55 3 56 1 57 2 60 1 61 2 62 63 64 1 65 1 1 66 69

Table below shows the frequency of each speed collected from a rural highway segment. calculate the 85-percentile speed. Note: The 85-percentile speed is designed as the speed at or below which 85% of the traffic is travelling. Speed (MPH Frequency 1 2 1 1 1 25 28 29 32 33 35 2 36 1 37 39 2 42 1 43 45 5 2 46 47 3 48 1 3 49 50 51 2 52 53 2 54 1 55 3 56 1 57 2 60 1 61 2 62 63 64 1 65 1 1 66 69

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter4: Traffic Engineering Studies

Section: Chapter Questions

Problem 15P

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Similar questions

Find Pace for data shown in table below which below represents speed spot study (SSS) data that recorded from urban collector highway in Tikrit city. E No. 1234 5 6 789 Speed group (mph) 20-25 25-30 30-35 35-40 40-45 45 - 50 50-55 55 - 60 60-65 Frequency (f) 0 4 13 28 41 37 22 9 0
6. (a) Define the peak hour factor (PHF) (b) Explain the traffic condition when PHF=1. 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 Day two Time Flow (veh) Flow (veh) 7:30 – 7:45 900 7:45 – 8:00 950 960 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 on traffic accident recorded on a certain intersection for the past 5 years has an accident of 4160 per million entering vehicles. If the average daily traffic entering the intersection is 504, find the total number of accidents during 5-year period. Use L=10 miles. a. 3862 b. 38.62 c. 3826 d. 38.26
The following data were taken on five vehicles travelling consecutively 1.5 km portion of the NLEX. Vehicle Time (minute) 1 1.2 1.0 3 1.4 4 1.3 1.1 Determine the time mean speed (kph) 76.07 75.00 O 76.00 O 75.07 2.
Imagine you are recording speed at a point along a three-laneroadway. All vehicles in lane 1 are traveling at 60 mi/h, all vehicles in lane 2 are traveling at 30 mi/h, and all vehicles in lane 3 are traveling at 45 mi/h. There is also a constant spacing of 3168 ft. between vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 60 minutes, what will be the time-mean speed and space mean speed for this traffic stream?
The speeds of 10 vehicles were measured at the midpoint of a (4.04-kilometer section of roadway. Vehicles The speeds of 10 vehicles were recorded: Assuming all vehicles were traveling at constant speed over this roadway section, calculate: a. Time-mean speed in kph b. Space-mean speed in kph c. Traffic Density in veh/km 1st 2nd 3rd 4th 5th Speed (kph) 42.3 54.2 68.8 35.8 48.6 Vehicles 6th 7th 8th 9th 10th Speed (kph) 78.5 96.1 41.5 28.4 36.2
Traffic at a certain intersection is 2076 cars per day. A consultant has told the city that traffic is expected to grow at a continuous rate of 4% per year. How much traffic will be expected at the end of 7 years O a. 15113.28 O b. 2746.82 O c. 2732 O d. 2747 O e. 15113
C. A data was gathered for the 10 vehicles passing in Katipunan Intersection every 15 seconds. Determine the Density, Flow of traffic per hour and space and time mean speed. Vehicle Distance "S" 1 99 m 95 m 3 96 m 4 94 m 5 96 m 6 99 m 7 93 m 92 m 8. 9 98 m 10 97 m
uestion 18 The density of traffic in a certain observation point on a highway was recorded to be 30 veh/km. If the space mean speed of the vehicle is 50 kph, how many vehicles will be passing every 30 minutes O A. 25.5 O B. 750 O C. 12.5 O D. 13 O E. None of the above «
1) 1) A section of highway has the following flow-density relationship: q-50k-0.156k² What is the capacity (maximum flow) of the highway section, the space mean speed at capacity, and the density when the traffic flow on the highway is at one-quarter of its capacity? 2) An observer has determined that the time headways between successive vehicles on a section of highway are exponentially distributed (arrival of vehicle is Poisson distribution) and that 60% of the headways between vehicles are 13 seconds or greater. If the observer decides to count traffic in 30-second time intervals, estimate the probability of the observer counting exactly four vehicles in an interval.
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 obtained from aerial photography showed 8 vehicles on a 356 m-long section of road. Traffic data collected at the same time indicated an average time headway of 4.8 sec. Determine the space mean speed in km/hr to one decimal place in accuracy