Figure 4 (in separate file) is a scaled drawing of a single lane roundabout in a

Question

Figure 4 (in separate file) is a scaled drawing of a single lane roundabout in a local street in an urban environment with a flat terrain. A colleague as determined the following minimum sight distance requirements for vehicles approaching the roundabout from the south:

Criteria 1: 60m

Criteria 2:

approach immediately to the right: 70m

all other approaches: 30m

Criteria 3:

absolute minimum ASD on southern approach: 50m

approach immediately to the right: 70m

Your colleague has asked you to draw the minimum sight distances for this roundabout and advise her which (if any) of these criteria are not satisfied. Select from the list below those criteria that are not satisfied. Marks will be deducted for incorrect choices.

Criteria 1

Criteria 2 - approach immediately to the right

Criteria 2 - all other approaches

Criteria 1

Criteria 2 - approach immediately to the right

Criteria 2 - all other approaches

Criteria 3

Explanation / Answer

Ans:--c

Proof:-

According to IRC

Where,

Min.sight distance sd=.278+v2/254f

Then sd?25m

SD?50m

According to give condition all the options are correct except option C because in this case it include the moving of vehicle directly to left but in this case SD should be more then 50m but here is SD=30m that's not possible.

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