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The ruling design speed for National Highways in mountainous terrain is:- 
1. 70 Km/hr
2. 60 Km/hr
3.  50 Km/hr
4. 40 Km/hr

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Correct Answer - Option 3 :  50 Km/hr

Concept:

Design Speed of Roads:

  • Design speed is defined as the highest continuous speed at which individual vehicles can travel with safety on the highway when weather conditions are conducive.
  • Design speed is the single most important factor that affects geometric design.
  • It directly affects the sight distance, horizontal curve, and the length of vertical curves.
  • Since the speed of vehicles varies with the driver, terrain, etc, a design speed is adopted for all the geometric designs.

Design Speed of Roads according to IRC given in the following table:

Road

Classification

Design Speed(km/hr)
Plain Rolling Mountainous Steep
Ruling Min Ruling Min Ruling Min Ruling Min
Expressways 120 100 100 80 80 60 80 60
NH and SH 100 80 80 65 50 40 40 30
MDR 80 65 65 50 40 30 30 20
ODR 65 50 50 40 30 25 25 20
VR 50 40 40 35 25 20 25 20

Where NH - National Highway, SH - State Highway, MDR - Major District Road, ODR - Other District Road, VR - Village Road

Hence, The ruling design speed for National Highways in mountainous terrain is 50 km/hr.

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