HIGHWAY MIDERM 2

Consistency

Is the most important rule in highway design.

Geometric Design

deals with the dimensions and layout of visible features of the highway

Geometric Design

will help in the reduction of accidents and their
severity

Geometric Design

fulfils the requirements of the driver and the vehicle, such
as comfort, efficiency and safety.

Goals of Geometric Design

Maximize the comfort, safety and economy of facilities
Provide efficiency in traffic operation
Provide maximum safety at reasonable cost
Minimize the environmental impacts

The main features considered for geometric design of highway are

Cross section elements
The gradient
The intersection
The consideration of sight distance

Design speed

is the single most important factor that affects the geometric design. It directly affects the sight distance, horizontal curve, and the length of vertical curves

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.

American Association of State Highway and Transportation Officials

AASHTO

speed

The _____ determined for design and correlation of the physical feature of a highway that influence vehicles operations

Topography

It is easier to construct roads with required standards for a plain terrain.However, for a given design speed, the construction cost increases multiform with the gradient and the terrain.