I-25 South Gap: Monument to Castle Rock

I-25 South Gap: Monument to Castle Rock

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The Gap is an 18-mile stretch of Interstate 25 from Monument to south of Castle Rock, connecting Colorado’s two largest cities, Denver and Colorado Springs. Tolling on these lanes began in 2024.

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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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HOV3+ users must have an ExpressToll account, a Switchable HOV transponder set to “HOV” mode, and three or more people in the vehicle to use the Express 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

  • Lanes are open 24/7.
  • 18 miles of Express Lanes from Monument to Castle Rock.
  • HOV 3+ will be available with a switchable HOV transponder.
  • Adjustable toll pricing system will be used – prices will depend on the time of day.
  • Overhead signs will indicate current toll prices. Tolls will be collected through the vehicle’s ExpressToll account or a License Plate Toll.