Scribd
Upload
51 views2 pages

Assignment

The document outlines a group assignment for a Traffic Engineering module at the Dar es Salaam Institute of Technology, focusing on vehicle crash analysis and speed data evaluation. It includes questions on calculating vehicle speeds, analyzing spot speed data, and studying freeway flow relationships. The assignment requires students to perform various calculations related to traffic flow, speed, and density based on provided data.

Uploaded by

Brown Justin Nz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
51 views2 pages

Assignment

The document outlines a group assignment for a Traffic Engineering module at the Dar es Salaam Institute of Technology, focusing on vehicle crash analysis and speed data evaluation. It includes questions on calculating vehicle speeds, analyzing spot speed data, and studying freeway flow relationships. The assignment requires students to perform various calculations related to traffic flow, speed, and density based on provided data.

Uploaded by

Brown Justin Nz
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 2

DAR ES SALAAM INSTITUTE OF TECHNOLOGY

DEPARTMENT OF CIVIL ENGINEERING


MODULE: CEU 07614 TRAFFIC ENGINEERING

GROUP ASSIGNMENT

Question 1:

You are shown a crash scene with a vehicle and a light pole. The vehicle was estimated
to hit the pole at 60km/h. The skid marks are measured to be 200, 205, 195 and 185 m.
A trial run that was conducted to help measure the coefficient of friction revealed that a
vehicle travelling at 70 km/h could stop in 100m under conditions present at the time of
an accident. How fast was the vehicle travelling in the beginning?
Question 2:

Using the spot speed data given in the following table, collected from an urban road in
Dar es Salaam City site operating under free-flow conditions:
a) Obtain Modal speed, Median Speed, speed limit and design speed
b) Compute the Time Mean Speed and Space Mean Speed

Speed Range Frequency


(km/h)
21-25 2
26-30 6
31-35 18
36-40 25
41-45 19
46-50 16
51-55 17
56-60 12
61-65 7
66-70 4
71-75 3
76-80 1

Question 2:
A set of 10 vehicles were observed for 80 seconds on a road segment that is 300m long.
The vehicle enter and leave the segment as per data shown in the table below.
Draw the time-space diagram and determine
a) Time mean speed and Space mean speed
b) Flow rate q
c) Density k
d) Average headway and Average spacing

Question 3:
A study of freeway flow at a particular site has resulted in calibrated speed-density
relationship with an equation: 𝒖 = 𝟏𝟎𝟎 − 𝟎. 𝟖𝒌.
Draw the following relationships; Speed-Density, Flow-Density and Speed-Flow and
evaluate

a) Free flow speed


b) Space mean speed at maximum flow
c) Maximum flow
d) Jam density

You might also like