Page 128 - Lecture Notes DCC3113

FEEDBACK ON EXERCISE 8


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

 Three-leg intersection (Consist of three approaches)
 Tee junction and Y junction

 Four-leg intersection (Consist of four approaches)

 Staggered junction, skewed junction, scissors junction, cross junction

 Multileg intersection (Consist of five of more approaches)

 Multiway junction

2. Describe briefly TWO (2) advantages and TWO (2) disadvantages of roundabout
(4 marks)
Advantages: Dis advantages:
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 Safety  Circle requires a wide flat area
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 Improved traffic flow  Pedestrian safety is not guaranteed
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 The circle will not easily be amended or modified
 Better solution for complex intersections
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 If traffic volume is too high, the circle will be
 Fewer conflict points
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“locked” and causes a long delay
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