The number of accidents has been recorded at an intersection in the last three years as follows: 18, 21, and 19. The accidents were mostly due to left-turning vehicles, speeding, and the absence of left-turn protection. The average ADT for the last 3 years is 8500. The following shows the crash reduction factor for various countermeasures: Reduction Factor Countermeasure Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines Prohibit left turns 0.10 0.30 0.35 0.05 0.75 a) Determine the appropriate countermeasures b) Determine the expected reduction in crashes if the countermeasures are implemented. The ADT is expected to increase 2%

The number of accidents has been recorded at an intersection in the last three years as follows: 18, 21, and 19. The accidents were mostly due to left-turning vehicles, speeding, and the absence of left-turn protection. The average ADT for the last 3 years is 8500. The following shows the crash reduction factor for various countermeasures: Reduction Factor Countermeasure Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines Prohibit left turns 0.10 0.30 0.35 0.05 0.75 a) Determine the appropriate countermeasures b) Determine the expected reduction in crashes if the countermeasures are implemented. The ADT is expected to increase 2%

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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b) What are the three májor c) The Zambian Road Transport and Safety Agency (RTSA) has established crash reduction factors shown in the table below. Countermeasure Reduction Factor 0.10 Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines Prohibit left turns 0.30 0.35 0.05 0.75 An intersection has been identified as having an abnormally high left-turn crash rate (17, 20, and 18 crashes in the last three years), attributed to excessive speeds and the absence of an exclusive left-turn phase. The ADT of the intersection for the last three years is 8400, and the ADT for after implementation is 9500. Determine: the appropriate countermeasures and ii. the expected reduction in crashes if the countermeasures a you have proposed are implemented. i.
The length of a highway is 550 m when a head-on vehicle collision occurred. Police reports show that neither human error nor vehicle malfunction was the cause of the collision. Check if the length of the highway is sufficient for an overtaking maneuver. *Accident Report: Speed of Overtaking Car = 96 kph, Speed of Overtaken Car = 88 kph, Perception-reaction Time = 2.5 sec, Average acceleration = 2.4 m/sec2, Time of the passing vehicle occupying the left lane = 10.4 sec, Distance between the passing vehicle at the end of its maneuver and the opposing vehicle = 84m.
A 2-mile long section of a roadway has recorded 20 crashes (total) during a period of 5 years. What is the crash rate for the section in terms of rate per 100 million entering vehicles?
SITUATION 3: According to the Department of Transportation the following data are gathered on a 20-mile long expressway for a period of 120 days. YEAR AVERAGE DAILY TRAFFIC NUMBER OF ACCIDENTS 2010 2753 100 2011 1857 120 2012 1875 95 2013 2548 115 2014 1995 135 2015 2354 150 2016 2158 85 a. Determine in which year has the lowest accident rate per million entering vehicle. b. Determine in which year has the highest accident rate per million entering vehicle. c. Determine the total accident rate per million entering vehicle. d. In what number of accidents will lower the accident rate per million entering vehicles to 50%. e. If the length of expressway considered is shorten to 10- miles and the N=1 year. Determine the accident rate per million entering vehicle.
The accident rate for 100 million vehicle miles of travel is 9.8. The length of the road is 15 mileswith an ADT of 67,000. Determine the estimated yearly reduction in total crashes if the crashreduction factor is one third.
The average number of collisions on Rt. 116 in South Deerfield is 15 per year. To address the high crash rate, a signal has been installed to make right-of-way explicit. The number of accidents in the following year was 9. MassDOT desires to know with how much confidence this reduction of accidents can be attributed to anything other than random chance.
1) The number of accidents has been recorded at an intersection in the last three years as follows: 18, 21, and 19. The accidents were mostly due to left-turning vehicles, speeding, and the absence of left-turn protection. The average ADT for the last 3 years is 8500. The following shows the crash reduction factor for various countermeasures: Countermeasure Reduction Factor Retime signals Provide left-turn signal phase Reduce speed limit on approaches Provide turning guide lines 0.30 0.30 0.35 0.05 a) Determine the appropriate countermeasures b) Determine the expected reduction in crashes if the countermeasures are implemented. The ADT is expected to increase 2%
a) What is the length of the longest queue in vehicles? b) How many minutes after the crash occurs does the queue clear in mins?
QUESTION 9 The adjustment for the access point density is based on empirical studies indicating that for each access point per mile, the estimated FFS decreases by 0.25 mi/h, regardless of the type of median. Note that these access points are those that influence traffic flow and that access points that go unnoticed by drivers are not included in the calculation of the access point density. Therefore, what is the expected reduction (mph) in FFS when the access density is 4 access points per mile. (enter a positive value)
2. Describe the following types of traffic volume counts and explain when they are used: (a) screen-line counts, (b) cordon counts, (c) intersection counts, and (d) control counts.
13. An incident that occurs on a particular highway results in traffic incurring an average delay of one hour per vehicle. An estimated 2,000 vehicles are impacted by the incident. If the distribution of traffic is comprised of 5% five-axle trucks, 2% three-axle trucks, 4% six-tire trucks, 2% four-tire trucks, 4% medium auto for business purposes, 3% small auto for business purposes, and the remainder are automobiles for personal purposes, what is the value of the total delay incurred by the traffic.
Question 48 Find the accident rate at a road intersection per million entering vehicles if the average daily traffic is 310 and 1,787 accidents had occurred in the last 3 years. Express your answer in whole number.