National Highway - 65 is an important link connecting Ambala (Haryana) to Pali (Rajasthan). The traffic operation in between Gotiya village to Salasar town of this national highway which lies in Rajasthan state is not satisfactory. Due to Rapid growth in commercial vehicles plying on this stretch, existing
carriageway width varying from 6.5 m to 7.0 m is insufficient. The visual inspection regarding the condition of existing flexible pavement showed normal riding quality which causes delay and thus increases operation cost. Looking at the present traffic and expected growth in future traffic, it has been suggested that two lane 7 m wide carriageway with 1.5 m wide paved shoulders on either side should be provided to make traffic operation smooth
and safe. For structural design of the road, soil investigations including Modified Proctor test and California Bearing Ratio (CBR) test were carried out. Axle load survey data was used to calculate the vehicle damage factor (VDF) and thus design traffic was calculated. On the basis of design CBR of 12% and design traffic 75 million standard axle (msa), total crust thickness comes out to be 620 mm as per guidelines of IRC: 37-2001.
Flexible pavement design, axle load survey, traffic volume and Vehicle Damage Factor (VDF)