Term
| What is the purpose of intersection design? |
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Definition
-Reduce conflicts between road users
-Improve efficiency and safety |
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Term
| What are the different intersection types? (there is 4) |
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Definition
-Uncontrolled
-Priority Controls
-Signalized
-Grade separated |
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Term
| Name 7 Intersection design basic principles |
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Definition
-Keep uniform and simple
-Consider what drivers will do rather than should do
-All required man oeuvres obvious even to stranger
-Avoid complex designs requiring complicated decisions
-Paths must be obvious
-Block short-cuts
-Road signs and markings designed before construction |
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Term
| In terms of visibility what is a must and a should? |
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Definition
Must:
-Provide stopping sight distance (SSD) in all directions
-Distinguish between major and minor roads
-No surprise
Should:
-Be simple, clear and understandable
-Provide unobstructed views across corners |
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Term
| What is the purpose of channelization and what methods are used? |
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Definition
Methods used are:
-Pavement markings
-Traffic islands
Purpose:
-Separate and regulate conflicting movements |
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Term
| What does the auxiliary lane length depend on? and when do you need use an island? |
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Definition
-Length varies 30-90m, depending on flow
-An island is needed if turning speeds are higher than 25 km/h |
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