Traffic and Highway Engineering - With Mindtap
5th Edition
ISBN: 9781305360990
Author: Garber
Publisher: CENGAGE L
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Chapter 5, Problem 10P
To determine
The fatal crash and total crash rates (per 100 million VMT)for each year and for the entire three-year period.
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The state transportation agency has established crash
reduction factors shown in the table. 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 8,400, and the ADT for after
implementation is 9,500. Determine (a) the appropriate
countermeasures and (b) the expected reduction in crashes
if the countermeasures are implemented. .
Countermeasure
Crash Reduction Factor
Retime Signals
0.10
Provide left-turn signal phase 0.30
Reduce speed limit on
approaches
0.35
Provide turning guide lines
0.05
Prohibit left turns
0.75
A proposed improvement will widen a two-lane rural highway from 9-ft-wide (per lane) to 11-ft-wide (per lane) if the highway has an AADT of 2100 veh/day. If there are an average of 25 crashes per year on the segment proposed for improvement, and 67% of the crashes are of the type targeted by the improvement, estimate the expected number of crashes (per year) after the improvement is constructed.
1. With the new highway interchange at a dangerous street intersection, police records indicate an average of 5 accidents per month. The Department of Traffic Safety wants to investigate the probability of the following occurring in any month:a) No more than 4 accidents.c) At least 2 accidents.b) A single accident.d) At most 2 accidents in 15 days.
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Traffic and Highway Engineering - With Mindtap
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- Find the crash frequency and crash rate of the following: Road Segment A: A three-mile section of road that has had four crashes over five years and has a traffic volume of 5,500 vehicles per day. Road Segment B: A three-mile section of road that has had 10 crashes over five years and has a traffic volume of 18,000 vehicles per day.arrow_forwardA state transportation agency want to evaluate engineering countermeasures applied to a two-lane,two-way rural highway segment.This 4 miles segment has been identified as having 14,19,and 23 total crashes in the last three years,before the implementation of the countermeasures.The AADT at the segment for last three years is 5630 vehicles per day and the AADT for after implementation is 6240 vehicles per day.Compute the expected average crash frequency for the after period, assuming the treatment was not implemented.The segment has the same conditions as the base conditions established for SPF.arrow_forwardA 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?arrow_forward
- 22. An intersection had 25 reported traffic crashes during the months of January through September. The AADT for the intersection is shown. What is the crash rate per million entering vehicles 2000 8000 4000arrow_forwardWhat are the major types of data that are needed for freeway congestion management? Emphasize on recurrent, non-recurrent, and emergency-event induced freeway congestion.arrow_forwardTransportation Engineeringarrow_forward
- Determine the predicted average crash frequency, in crashes (per year), on a 7-mile segment of a rural divided multilane highway with 10-ft lanes and 8-ft paved shoulders that carries an AADT of 15,000 vehicles per day. The proportion of total crashes constituted by CMF-related crashes is 0.55.arrow_forwardThe crash rate on a heavily traveled two-lane rural highway is abnormally high. Thecorridor is 14 miles long with an ADT of 34,000. An investigation has determined thathead-on collisions are most common with an RMVMT of 4.5 and are caused by vehicles attempting to pass. Determine an appropriate countermeasure and calculate theestimated yearly reduction in total crashes.arrow_forwardANSWER ALLarrow_forward
- Problem 1. A segment of a two-lane rural highway of length 5.2 miles carries 10,000 vehicles per day traffic. The width of lane is 11 ft with 6 ft wide paved shoulder. What is the predicted number of total crashes of the segment?arrow_forward10.A lane on a freeway displays the following characteristics: (a) average headway between vehicles is 1.9s, and (b) the average spacing between vehicles is 210 feet. What is the rate of flow for the lane? What is the average speed in mi/hr? 11. Define 'Crash Modification Factor (CMF)" and describe how one might be used by a transportation agencyarrow_forwardQ 04: Discuss Road accident data base and also suggest what remedial measures are required to reduce the causes of accidents.arrow_forward
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