Reliability Engineering 2nd Edition Solutions Manual – Complete Chapters (Elsayed)

All Chapters Covered
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SOLUTIONS

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Traffic Engineering, 5 Edition Q Q




Roess, R.P., Prassas, E.S., and McShane, W.R.
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Solutions to Homework No. 2 Q Q Q Q




Problem 5‐1 Q




A volume of 1,200 veh/h is observed at an intersection approach. Find the peak flow rate wi
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thin the hour for the following peak-
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hour factors: 1.00, 0.90., 0.80, 0.70. Plot and comment on the results.
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The peak flow rate of flow is computed as v = V/PHF. The table below summarizes the resu
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lts for the information given. A plot follows.
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Even with the same hourly volume,
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a small difference in PHF leads to
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an enormous difference in peak fl
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ow rates. Traffic engineers must b
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e able to deal with this peaking ch
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aracteristic on a regular basis. Q Q Q Q

,Problem 5‐2 Q




A traffic stream displays average vehicle headways of 2.4s at 55 mph. Compute the den
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sity and rate of flow for this traffic stream.
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A headway can be converted to a flow rate as follows:
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v = 3600 = 3600 = 1,500 veh/hr/ln
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h 2.4

Knowing both flow rate and speed (given), the density may now be computed as:
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D = v = 1500 = 27.3 veh/hr/ln
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S 55



Problem 5‐3 Q




A freeway detector records occupancy of 0.26 for a 15- minute period. If the detector is
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3.5 ft long, and the average vehicle has a length of 18 ft. what is the density implied by this m
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easurement?

Density is obtained from occupancy as follows:
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Such a high value is indicative of highly congested conditions within a queue.
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, Problem 5‐4 Q




The following traffic count data were taken from a permanent detector location on a majo
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r state highway. From this data, determine (a) the AADT, (b) the ADT for each month. (c) t
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he AAWT, and (d) the AWT for each month. From this information, what can be discerned a
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bout the character of the facility and the demand it serves?
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The table below illustrates the computation of monthly ADT and AWT values.
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The AADT is computed as the total annual volume divided by 365 days, or:
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AADT = 2,365,000 = 6,479 veh/day
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365

The AAWT is computed as the total weekday volume divided by 260 days, or:
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AAWT = 2,067,000 = 7,950 veh/dayQ Q Q Q Q




260




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