An Optimization Model for Design of Asphalt Pavements Based on IHAP Code Number 234

Table 1

Design parameters for different class of roads [15].

Class of road	Reliability	Standard normal deviate
Expressways and freeways	90	−1.282	0.35	4.2	3.0
Major rural roads	80	−0.841	0.35	4.2	2.5
Secondary rural roads (2nd class)	70	−0.524	0.35	4.2	2.0