TRANSPORTATION ENGINEERING

HIGHWAY CROSS-SECTION ELEMENTS

The highwaycross section is made up of designelements which can be classified into three broad groups:

1. The traveled way: pavement surface,lane widths, normalcross slopes.

2. Road margins: shoulders, sidewalks, curbs, guard rails & guard posts, roadside slope.

3. Traffic separation: the median.

1. The travelled way (carriage way): It is the portionof the roadway used by the vehicle drivers formovement. It contains of pavement excluding road margins

Pavement surfaces:

• For heavy traffic volumes, the pavement surface should be strong enough and also smooth top revent high friction and may be designed with minimum cross slope.

• Low - type rough surfaces must be crown enough to drain well.

• Low- type surfaces tend to reduce operating speeds.