ROAD STANDARDS

The design standard is classified into seven groups (R6,R5, R4,R3,R2,:R1 & R1a) for rural areas and into seven groups
(U6,U5,U4,it3,U'2,U1,& Uta)

for urban areas. These are in descending order of hierarchy.

(a) Standard. R6/U6 :

Provides the highest geometric design standard for rural or urbanareas. They usuallyserve long trips with high speed of travelling, comfort and safety.It is always designed with divided carriage way and with full access control. The Rural and Urban Expressway falls under this standard.

(b) Standard. R5/U5:

Provides also high geometric standard and usually serve long to intermediate trip lengths with high to median travelling speeds. It is usually with partial access control, The Highway, Piimary Road and Arterial falls under this standard.

(c) Standard R4/U4:

Provides medium geometric standard and serve intermediate trip lengths with medium travelling speeds. It is also usually with partial access control. The Primary Road,Secondary Road, Minor Arterial and Major collector falls under this
standard.

(d) Standard R:3/U3:

Provides low geometric standard and serves mainly local traffic. There is partial or no access control. The Secondary Road, Collector or Major Local Streets falls
under this standard.

(e) Standard R2/U2:

Provides the lowest geometric standard for two way flow. It is applied only to local
traffic with low volumes of commercial traffic. The Minor Roads and Local Streets fall under this standard.

(f) Standard R1/U1:

Provides very low geometric standard and is applied to very low traffic where the chances of two way flow is low.

(g) Standard R1a :

Applied to local access to restricted areas such as access to microwave stations and
security areas.