Given the following spot speed data:Speed GroupObserved vehicles45-49550-531654-572958-613662-654166-692170-734A. Calculate the 15th, 50th, and 85th percentile.B. Recommend appropriate speed limits with justification.

Speed Group Observed Vehicles Cumulative No. of Vehicles 45-49 5 5 50-53 16 21 54-57 29…

Answered: Given the following spot speed data:…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Assume you are an observer standing at a point along a three-lane roadway. All vehicles in lane 1 are traveling at 30 mi/h, all vehicles in lane 2 are traveling at 45 mi/h, and all vehicles in lane 3 are traveling at 60 mi/h. There is also a constant spacing of 0.5 milebetween vehicles. If you collect spot speed data for all vehicles as they cross your observation point, for 30 minutes, what will be the time-mean speed and space meanspeed for this traffic stream?
An intersection has a three-phase signal with the movements allowed in each phase and corresponding analysis and saturation flow rates shown in the table below. Assume the lost time is 4 seconds per phase and a critical intersection v/c of 0.90 is desired. Phase 2 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WBL EB T/R, WB T/R Analysis flow rate 330, 365 veh/h 1125, 1075 veh/h 110, 80 veh/h 250, 285 veh/h Saturation flow rate 1700, 1750 veh/h 3400, 3300 veh/h 650, 600 veh/h 1750, 1800 veh/h Calculate minimum cycle length O 255 sec O 155 sec O 100 sec O 60 sec
This is one question split into parts a and b
Vehicles arrive to the park entrance at a constant rate of 900 veh/hour from 7:30 AM to 8:10 AM and then at a constant rate of 600 veh/hour from 8:10 A.M. The park opens at 8:10 A.M. and the manager wants to set the departure rate so that the average delay per vehicle (i.e.: Total delay/total number of arrival) is no greater than 24 minutes (measured from the time of the first arrival until the total queue clears). Assuming D/D/1 queuing, what is the minimum departure rate (?) needed to achieve this? What is the total delay at this rate? What is the longest Queue?
An intersection has a four-phase signal with the movements allowed in each phase and corresponding and saturation flow rates shown in the table below. Phase 1 2 3 4 Allowed movements EB L, WB L EB T/R, WB T/R SB L, SB T/R NB L, NB T/R Analysis flow rate 245, 230 veh/h 975, 1030 veh/h 255, 235 veh/h 225, 215 veh/h Saturation flow rate 1750, 1725 veh/h 3350, 3400 veh/h 1725, 1750 veh/h 1700, 1750 vehh Calculate the sum of the flow ratios for the critical lane groups. O 0.714 O 0.723 0.751 0.702
Based on the count data shown below, is a traffic signal justified under warrant 1 or warrant 2? The major road is in the E-W direction and minor road is in the N-S direction. Assume there are two lanes on all approaches and the major road speed limit is 35 mph. Hour Beginning 7 AM 8 AM 9 AM 10 AM 11 AM 12 PM 1 PM 2 PM 3 PM 4 PM 5 PM 6 PM SB Approach 321 289 161 139 167 281 256 226 204 239 243 227 Mean volume counts, each hour EB Approach 403 366 284 304 354 413 397 433 340 440 517 423 WB Approach 168 189 137 167 223 301 284 306 258 322 393 355
Data from a 6ft by 6ft inductive loop detector collected during a 60 second interval indicates that the mean speed of traffic is 50mph among the 32 vehicles counted. Assume an average vehicle length of 19ft. Calculate a. The density, b. The occupancy, and C. The flow rate during this interval.
1. Flow is defined as the equivalent hourly rate at which vehicles pass a point on a highway during a time period. 2. The theoretical minimum value of occupancy for a loop detector installed on a highway is 3. The vehicle headway is always less 4. Time-mean speed is equal to the arithmetic (greater/less) than the value of time gap. (arithmetic/harmonic) mean of the spot speed values.
Assume you are an observer standing at a point along a three‐lane roadway. All vehicles in lane 1 are traveling at 30 mi/hr, all vehicles in lane 2 are traveling at 45 mi/hr, and all vehicles in lane 3 are traveling at 60 mi/hr. The spacing between vehicles in each lane is 0.5 mile. If you collect spot speed data for all vehicles as they cross your observation point for 2 hours, what will be the time‐mean speed and space‐mean speed for this traffic stream?
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
14.6 Car 15.2 Car 19.0 Truck 15.5 Car 14.3 Car 17.4 Truck 13.7 Car The vehicles were selected by sampling whatever vehicle was entering the section, choosing every 30 seconds. Estimate the time mean speed and the space mean speed, by vehicle type, and overall
Through the Walla Walla Road to the entrance of the E-1 parking lot at the University of Washington, vehicles begin to arrive from 7:40 A.M. at a uniform deterministic rate of 480 vph until 8:20 A.M. and from then on at 120 vph. It takes 10 seconds for a vehicle to go through the paying process at the gate. If the parking lot is open at 8:00 A.M., determine (a) when the queue will dissipate, (b) the total delay, (c) the average delay, (d) the maximum queue length (in vehicles), and (e) the longest vehicle delay under FIFO. Show your results graphically. [Hint: D/D/1 analysis]

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Given the following spot speed data: Speed Group Observed vehicles 45-49 5 50-53 16 54-57 29 58-61 36 62-65 41 66-69 21 70-73 4 A. Calculate the 15th, 50th, and 85th percentile. B. Recommend appropriate speed limits with justification.