Answered: What is the time-mean speed? Present…

Engineering

Civil Engineering

What is the time-mean speed? Present your answer in units of [feet/sec] to two decimal places?

Traffic and Highway Engineering

5th Edition

ISBN:9781305156241

Author:Garber, Nicholas J.

Publisher:Garber, Nicholas J.

Chapter14: Highway Surveys And Location

Section: Chapter Questions

Problem 11P

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Concept explainers

British Gravitational Bg System Of Units

Measuring is the comparison of a particular physical quantity with its reference value. A unit is a fixed physical quantity. The length is a physical quantity. A physical quantity is the product of a unit and the numerical value we need to compare with. 

Question

A) What is the time-mean speed? Present your answer in units of [feet/sec] to two decimal places?

B) What is the spacing between the vehicles in Image 1? Present your answer to the nearest foot.

C) I calculate that the (average) density obtained from these images is 18.2 [veh/mi]. Assume that this value is correct, even if I made a mistake.
If a loop detector sensing these vehicles was occupied 5% of the time, what is the average length of the vehicles? Present your answer in units of feet to one decimal place.

The distances in feet from some X = 0 reference point of two vehicles appearing in two air photos taken
two seconds apart are shown in Table 6.
Table 6. Distances in feet of two vehicles from reference X = 0
in two images, taken two (2) seconds apart
Image 2
320 [ft]
600 [ft]
Image 1
500 [ft]
800 [ft]
Veh 1
Veh 2

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