Introduction
Utah is one of the few states that uses flex lanes—special lanes where the direction of travel changes based on traffic demand. They are designed to keep traffic moving smoothly during rush hours by providing extra lanes in the direction with the heaviest flow.
How Flex Lanes Work
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Reversible Traffic Flow – The lanes change direction depending on the time of day. In the morning, more lanes may be open going into the city. In the evening, more lanes open heading out.
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Overhead Signs – Electronic signals above the lanes show drivers whether a lane is open, closed, or reserved for the opposite direction.
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Green arrow: Lane is open for your direction.
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Red X: Lane is closed to you—never drive here.
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Yellow arrow or flashing signal: Lane direction is about to change—merge out safely.
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Barrier-Free – Unlike divided highways, flex lanes do not have physical barriers separating directions. Instead, drivers must obey the overhead signs and lane markings.
Where You’ll See Flex Lanes in Utah
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The most well-known flex lanes in Utah are on State Street in Sandy (between 6200 South and 10600 South).
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They are also used in certain construction or high-traffic corridors managed by UDOT.
Rules for Driving in Flex Lanes
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Always look up at the overhead signals—never assume a lane is open.
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Never enter a lane marked with a red X.
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Follow posted speed limits and lane-change restrictions.
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Be extra cautious—vehicles may be closer than expected when lanes change direction.
Why Utah Uses Flex Lanes
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To reduce congestion during peak traffic hours.
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To avoid costly road widening projects.
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To make better use of existing road space.
Common Mistakes to Avoid
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Ignoring the overhead signs.
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Driving in a lane marked with a red X.
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Waiting too long to merge out when a lane is closing.
Why It Matters
Flex lanes are an efficient solution to traffic congestion, but they require drivers to stay alert and follow signals carefully. Understanding how they work ensures your safety and keeps traffic moving smoothly for everyone.
✅ Takeaway: In Utah flex lanes, the lane direction changes with traffic demand. Always watch for overhead signals, follow the green arrows, and never enter a lane with a red