I-25 South Gap: Monument to Castle Rock

I-25 South Gap: Monument to Castle Rock

This project will build one new Express Lane in each direction of I-25 along an 18-mile stretch known as "The Gap"—south of Castle Rock to Monument. The I-25 South Gap Express Lanes opened with tolls waived for testing in December 2021.

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How to Use Express Lanes

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Vehicles with one to two people pay a toll to use the Express Lanes with an ExpressToll account or through a License Plate Toll.

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Vehicles with three or more people must have an ExpressToll account and Switchable HOV transponder to use the lanes for free.

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Motorcyclists can use the Express Lanes for free without a pass.

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Bus and other transit can travel in the Express Lanes.

Corridor Basics

  • 18 miles from Monument to Castle Rock
  • The project will add one Express Lane in each direction, along with safety, infrastructure, and wildlife crossing improvements.
  • Motorists will have a choice to take the general-purpose lanes for free, or drive the Express Lanes for a shorter and more reliable travel time in exchange for a toll.
  • Vehicles with three or more people and motorcycles will be able to use the Express Lanes for free.
  • Substantial construction completion is scheduled for late 2021, with tolling to begin in 2022.
  • Overhead signage will indicate toll prices, and tolls will be collected through ExpressToll account or through License Plate Toll.