Рубрика: HIGHWAY ENGINEERING HANDBOOK

SERVICE ROADS

Service roads, or frontage roads, as they are sometimes called, are used to enhance capacity on the mainline, control access, serve adjacent properties, or maintain traffic circulation. They permit development of adjacent properties while preserving the through character of the mainline roadway. Service roads may be either one-way or two-way, depending on where they are […]

MULTILANE RAMP AND ROADWAY TERMINALS AND TRANSITIONS

When two roadways converge or diverge, the less significant roadway should exit or enter on the right. Left-hand exits or entrances are contrary to driver expectancy and should be avoided wherever possible. 2.7.1 Multilane Entrance Ramps and Converging Roadways Figure 2.46 shows recommended designs to be used for multilane entrance ramps and converging roadways. Converging […]

INTERCHANGE RAMP DESIGN

An interchange ramp is a roadway that connects two legs of an interchange. Ramp cross­section elements are discussed in Art. 2.3, Cross-Section Design. Elements contributing to horizontal and vertical alignments are designed similar to any roadway once the ramp design speed has been determined. 2.5.1 Ramp Design Speed To design horizontal and vertical alignment features, […]

Interchanges

An interchange is defined as a system of interconnecting roadways in conjunction with one or more grade separations that provides for the movement of traffic between two or more roadways or highways on different levels. Interchanges are utilized on freeways and expressways, where access control is important. They are used on other types of facilities […]