The pollutant mostly released by automobiles is?

In which year was the Central Road Fund scheme formed?

The minimum value of 15-minute peak hour factor on a section of a road is 

The star and grid pattern of the road network is typically adopted in which city's road plan?

The design speed for a NH is 100 kmph. If the maximum permissible superelevation is 0.10 and the coefficient of lateral friction is 0.15, the ruling minimum radius of horizontal curve on the highway should be

A signalized intersection operates in two phases. The lost time is 3 seconds per phase. The maximum ratios of approach flow to saturation flow for the two phases are 0.37 and 0.40. The optimum cycle length using the Webster's method (in seconds) is

In the marshal method of mix design, the coarse aggregates, fine aggregates, filler and bitumen, having respective specific gravities of 2.62, 2.72. 2.70 and 1.02 are mixed in the ratio of $5, 34.6, 4.8 and 5.6 percent, respectively. The theoretical specific gravity of the mix would be

The speed of the overtaking vehicle in a two-way traffic road is 90 km/hr, and the speed of the overtaken vehicle is 60 km/hr. The acceleration of the overtaking vehicle is 0.9 m/s². Assuming the time taken for overtaking is 2 seconds, calculate the safe overtaking sight distance.

A vehicle is moving on a road of grade +4% at a speed of 20 m/s. Consider the coefficient of rolling friction as 0.46 and acceleration due to gravity as 10 m/s². On applying brakes to reach a speed of 10 m/s, the required braking distance (in m, round off to nearest integer) along the horizontal, is

The radius of a horizontal circular curve on a highway is 120 m. The design speed is 60 km/hour, and the design coefficient of lateral friction between the tyre and the road surface is 0.15. The estimated value of superelevation required (if full lateral friction is assumed to develop), and the value of coefficient of friction needed (if no superelevation is provided)

will, respectively, be