TABLE OF CONTENTS 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.
Figure 2.46 shows recommended designs to be used for multilane entrance ramps and converging roadways. Converging roadways are defined as separate and nearly parallel roadways or ramps that combine into a single continuous roadway or ramp having a greater number of lanes beyond the nose than the number of lanes on either approach roadway. Class I, II, and III entrance terminals should be used in lieu of converging roadway drawings when applicable. Class I and II converging roadways should be used when either or both of the converging roadways are mainline roadways of an expressway or a freeway. Class III should be used at the convergence of directional ramps within an interchange or at the convergence of interchange ramps with non-limited-access roads or streets. In general, class III is applicable at all locations other than those requiring the use of class I or II.
Lane Balance and Continuity. To avoid inside merges, the number of mainline lanes plus converging lanes approaching the nose must be equal to the resultant number of lanes leaving the...
