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Transportation Engineering Questions

Question Description
Q1 What are horizontal and vertical curves in highway in engineering practice? Use at least two (2) practical examples EACH, to illustrate the difference between the two.

Qu 2 Data obtained from aerial photography showed thirteen (13) vehicles on a 1100 ftlong section of road. Traffic data collected at the same time indicated an average time headway of four (4) seconds. Determine (a) the density on the highway, (b) the flow on the road, (c) the space mean speed.

Qu 3 Describe ‘shock-wave’ effect in a traffic stream along a highway segment. Differentiate between Greenshields and Greenberg analytical models. Under what traffic conditions will you be able to use the Greenshields model but not the Greenberg model?

Qu 4 What factors must a transportation engineer consider in developing a traffic control design? List and describe five (5) design considerations that guide traffic control design.

Qu 5 Illustrate graphically, the relationship between superelevation, grade, and radius of horizontal curve. If a horizontal curve is to be designed for a section of a highway having a design speed of 55 mi/h and if the physical conditions restrict the radius of the curve to 580ft, a) What value is required for the superelevation at this curve? b) Is this a good design? Why or why not?

Qu 7 A local jurisdiction has determined that for a given set of geometric conditions, a maximum rate of six (6) crashes/million entering can be tolerated. a) If at an intersection of two roadways with ADTs of 10,000 and 7500 how many crashes can occur before corrective action must be sought? b) If along a 2.5 mile section of one roadway has an ADT 6500 and over the yearlong study period, four (4) crashes occurred on this portion of roadway and two (2) of them resulted in fatalities. Determine the appropriate crash rates for this location and discuss the implications.

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