Posted: February 9, 2021
Last modified: February 28, 2022

New auxiliary lanes throughout the I-4 Ultimate project make it easier than ever to enter and exit Interstate 4 (I-4).

By the end of 2020, the Florida Department of Transportation (FDOT) had shifted all 21 miles of the project into their final configuration. Though the number of general use lanes remains the same as prior to construction, the new auxiliary lanes are a feature that adds capacity.

What Are Auxiliary Lanes?

Auxiliary lanes are used differently than general use lanes. The main purpose of auxiliary lanes is to separate traffic that is entering or exiting the highway and allow it to speed up or slow down, as needed. Often placed between exit and entrance ramps, the auxiliary lanes help reduce bottlenecks and weaving. Drivers will notice auxiliary lanes between many of the 15 interchanges in the 21-mile project, such as between John Young Parkway and Conroy Road on westbound I‑4 (pictured above).

How to Use Auxiliary Lanes

Entering: When entering I-4, stay in the auxiliary lane, which is separated by a white dotted line, and accelerate to highway speed before moving into the general use lane to the left.

Exiting: When exiting I-4, move into the auxiliary lane on the far right and continue to slow down until reaching the end of the ramp.

General use drivers should not use the auxiliary lanes as passing lanes.

Motorists should keep their eyes on the road and pay attention to roadway signs, as navigational systems may not be up to date with current configurations. For more tips on how to navigate new movements on I-4, visit