mangeshwakankar,
You need to be a little careful where speeds/distances are altered and whether the value is added or subtracted. I would suggest that 108s whislt notionally correct would be better written as adding to the minimum headway distance as kball's attempt at the question.
In effect, headway can be thought of in two ways.
1) signal braking distance is a safety measure
2) headway time is an operational requirement.
Signalling means we ensure safety first, we satisfy the operational requirement secondly. The distinction is very important and shows an understanding of the principles.
You need to be a little careful where speeds/distances are altered and whether the value is added or subtracted. I would suggest that 108s whislt notionally correct would be better written as adding to the minimum headway distance as kball's attempt at the question.
In effect, headway can be thought of in two ways.
1) signal braking distance is a safety measure
2) headway time is an operational requirement.
Signalling means we ensure safety first, we satisfy the operational requirement secondly. The distinction is very important and shows an understanding of the principles.
Le coureur