Discussion
Psychological Widening in the extra width provided in the pavement on the curves is:
(symbols have their usual meaning)
Answer: B
Psychological widening is \(V/9.5\sqrt{R}\).
On curves, drivers tend to keep a greater clearance from the vehicle alongside, so IRC adds a psychological widening in metres:
\[ W_{ps} = \frac{V}{9.5\sqrt{R}} \]
with V in km/h and R in metres. The total extra width is this plus the mechanical widening \(nl^{2}/2R\), which allows for the rear wheels tracking inside the front wheels; that formula, with n lanes and wheelbase l, is the trap option. \(V/2R\) and \(nl^{2}/R\) are not standard forms.
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