Assignment

A two$-$lane highway has a speed limit of $40$ mph and each lane is $12$ feet wide. The road has a geometry as shown in the figure. The curve provides a distance of $20$ feet from the edge of a building to the edge of the road. A traffic accident occurred recently where the driver was eastbound and collided with a fixed object in the taxiway, resulting in a serious injury to the driver and a lawsuit alleging that the $40$ mph speed limit is unsafe for traffic. horizontal curve and the main cause of the accident.

The design agency hires you as an expert to evaluate the accident and the curve design. A typical driver has a reaction time of $2\mathrm{.}5$ seconds and applies a deceleration of $11\mathrm{.}2f\frac{t}{s}2.$