A road segment 5500 m long has an annual average daily traffic (AADT) of 8000 veh/day. The Safety Performance functions for injury, fatal, and property damage only(PDO) crashes developed from similar entities are: SPFatal = 0.3 * 10-6 (L) (AADT0.491) SPinjury = 1.602 * 10-6 (L)(AADT0.491) SPPDO = 3.811 10-6 (L)(AADT0.4⁹1) * Determine the following: Number of fatal crashes per year Number of injury crashes per year Number of property damage only crashes per year 1. 2. 3. Answers: 1. Number of fatal crashes per year = 2. Number of injury crashes per year = 3. Number of property damage only crashes per year

A road segment 5500 m long has an annual average daily traffic (AADT) of 8000 veh/day. The Safety Performance functions for injury, fatal, and property damage only(PDO) crashes developed from similar entities are: SPFatal = 0.3 * 10-6 (L) (AADT0.491) SPinjury = 1.602 * 10-6 (L)(AADT0.491) SPPDO = 3.811 10-6 (L)(AADT0.4⁹1) * Determine the following: Number of fatal crashes per year Number of injury crashes per year Number of property damage only crashes per year 1. 2. 3. Answers: 1. Number of fatal crashes per year = 2. Number of injury crashes per year = 3. Number of property damage only crashes per year

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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Concept explainers

Capacity and Level of Service at Intersections

The term capacity is associated with transportation engineering. Capacity helps to understand how many pedestrians or vehicles can be handled by a transport facility. Level of service is also a term associated with transportation engineering. The level of service indicates the performance of the transport facility.

Question

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A road segment 5500 m long has an annual average daily traffic (AADT) of 8000 veh/day. The
Safety Performance functions for injury, fatal, and property damage only(PDO) crashes
developed from similar entities are:
SPFatal = 0.3 * 10-6 (L) (AADT0.4⁹1)
= 1.602 * 10-6 (L) (AADT 0.491)
SPinjury
SPPDO = 3.811 10-6 (L) (AADT0.491)
Determine the following:
1.
2.
3.
Number of fatal crashes per year
Number of injury crashes per year
Number of property damage only crashes per year
Answers:
1. Number of fatal crashes per year =
2. Number of injury crashes per year =
3. Number of property damage only crashes per year =
Report your answers to the closest two decimal places without units (i.e., if your answer is
0.258, you should enter 0.26 or if your answer is 3.564, enter 3.56)

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The predicted traffic mix of a proposed four-lane urban non-interstate freeway is as follows. Passenger cars = 78% Single-unit trucks: 2-axle, 5,000 lb/axle = 12% 2-axle, 9,000 lb/axle = 4% 3-axle or more, 23,000 lb/axle = 3% Tractor semitrailers and combinations: 3-axle, 20,000 lb/axle = 3% The projected AADT during the first year of operation is 3,900 (both directions). If the traffic growth rate is estimated at 3 percent and the CBR of the subgrade is 7.5, determine the depth of a full-asphalt pavement (in inches) using the AASHTO method and n = 20 years. The resilient modulus of the asphalt (EAC) is 320,000 lb/in². Assume m, for the subgrade is 1 and the percent of traffic on the design lane is 42 percent, pt = 2.5, and SN = 4. Use a reliability level of 90 percent, a standard deviation of 0.45, and a design serviceability loss of 2.0. Assume the design lane factor f is 0.42. (Use single-axle load equivalency factors for 2-axle vehicles and tandem-axle load equivalency factors for…
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A freeway traffic stream was observed to have a density of 22.0 veh/mi/ln when the mean speed was 55.0 mi/h. On another occasion at the same location, the jam density was found to be 132 veh/mi/ln. Assume Greenshields' model of traffic flow applies. The optimum speed (in mi/h) is: a) 22.0 b) 33.0 c) 55.0 d) 66.0 e) None of he above