Page 127 - Lecture Notes DCC3113

EXERCISE 8

1. State FOUR (4) types of grade-junction
(4 marks)

2. Describe briefly TWO (2) advantages and TWO (2) disadvantages of roundabout
(4 marks)

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3. Two phase traffic light is suggested for a junction. Based on Table, determine
i. Total of loss time, L
ii. Optimum Cycle Length, Co
iii. Effective green time for each phase
iv. Actual green time for each phase
v. Sketch the time phase diagram

Table 8-6: Saturation Flow Table
Direction/Cabang North/Utara South/Selatan East/Timur West/Barat
Actual flow/Aliran Sebenar (q) 550 700 500 880
pcu/h
Saturation Flow/Aliran Tepu, 1975 1975 1875 1875
S (pcu/hr)

Given: Intergreen time = 5 seconds
Amber period = 3 seconds
Lost time = 2 seconds(15 marks)

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