# GATE Papers >> Civil >> 2015 >> Question No 63

Question No. 63

A sign is required to be put up asking drivers to slow down to 30 km/h before entering Zone Y (see figure). On this road, vehicles require 174 m to slow down to 30 km/( the distance of 174 m includes the distance travelled during the perception – reaction time of drivers). The sign can be read by 6/6 vision drivers from a distance of 48 m. The sign is placed at a distance of x m from the start of Zone Y so that even a 6/9 vision driver can slow down to 30 km/h before entering the zone. The minimum value of x is ________ m.

##### Answer : 141.84 to 142.32

Solution of Question No 63 of GATE 2015 Civil Paper

For a 6/6 person driver can see the board from distance 48 m

for a 6/9 person driver can see the board from distance 48 $\times\frac69$ = 32 m

Vehicle require 174 m to slow down to 30 km/hr. So minimum distance of X from the start of Y zone

= 174 – 32

= 142 m

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