A continuous auxiliary lane should be constructed between the entrance and exit terminals of interchanges where the distance between the successive painted noses of an entrance-exit (EN-EX) ramp combination is less than 2,000-ft on a freeway or 1,500-ft on a collector-distributor or frontage road.

An auxiliary lane may be introduced as a single exclusive lane or in conjunction with a 2-lane entrance. Refer to for more information concerning the termination of auxiliary lanes. The design of auxiliary lanes should be based on the traffic volumes for the exiting, entering and through movements through the procedures can be referred to in the which is applicable to all freeway contexts.

See for additional information regarding auxiliary lanes.