Various stresses in jointed plain concrete pavement with slab size of 3.5 m × 4.5 m are denoted as follows:

Wheel load stress at interior = $S_{wl}^i$
Wheel load stress at edge = $S_{wl}^e$
Wheel load stress at corner = $S_{wl}^c$
Warping stress at interior = $S_t^i$
Warping stress at edge = $S_t^e$
Warping stress at corner = $S_t^c$
Frictional stress between slab and supporting layer = $S_f$

The critical stress combination in the concrete slab during a summer midnight is

A car is travelling at a speed of 60 km/hr on a section of a National Highway having a downward gradient of 2%. The driver of the car suddenly observes a stopped vehicle on the car path at a distance 130 m ahead, and applies brake. If the brake efficiency is 60%, coefficient of friction is 0.7, driver’s reaction time is 2.5 s, and acceleration due to gravity is $9.81 \text{ m/s}^2$, the distance (in meters) required by the driver to bring the car to a safe stop lies in the range