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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Traffic engineering
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
Traffic data are collected between Point X and Y. Seven vehicles pass in Point X at intervals of 18, 17, 19, 28, 25, 22, and 24 sec respectively. The vehicle's speeds are 60, 50, 55, 58, 52, 49, and 30 kph respectively. Calculate the flow, density, time mean speed, and space mean speed. Determine also the length of the segment.
ANSWER 22 AND 23
One of the following choices is not among the safety applications that the Spot Speed Study Data have : Determining proper intersection stopping distance. Evaluation proper speed limits. Determining proper stopping sight distance. Establishing the limits of no-passing zones.
What will be the time-mean speed and space-mean speed for such a traffic stream based on the acquired spot speed data for all cars as they cross the observation site for 60 minutes? show your complete solution please
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?
Calculate the minimum passing sight distance required for a two-lane rural roadway that has a posted speed limit of 45 mi/h. The local traffic engineer conducted a speed study of the subject road and found the following: average speed of the passing vehicle was 47 mi/h with an average acceleration of 1.43 m/h/sec, and the average speed impeder vehicles was 40 mi/h. Show your solutions.
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 1 2 3 Allowed movements NB L, SB L NB T/R, SB T/R EB L, WB L EB T/R, WB TR 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 vehh Calculate minimum cycle length O 255 sec O 60 sec O 155 sec O 100 sec
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

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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.