Image credit: Chasqui (Luis Tamayo) via Flickr, CC BY-SA 2.0. License: CC BY-SA 2.0.
Solo drivers on U.S. Highway 75 through Dallas and Collin counties are close to reclaiming a lane that used to stay closed to them all day. The Texas Department of Transportation says the conversion of former high-occupancy vehicle lanes into peak-hour technology lanes from Interstate 635 to State Highway 121 is about 99 percent complete and on track to finish this fall.
The change matters for anyone commuting or connecting through North Central Expressway. Once signage and lane-management testing are done, the inside lanes open to every vehicle for 22 hours a day. Narrow weekday peak windows still reserve those lanes for carpools, low-emission vehicles, and motorcycles.
- Corridor: US 75 from I-635 in Dallas County to SH 121 in Collin County.
- Status: TxDOT reports roughly 99 percent complete, with finish targeted this fall.
- Solo access: Inside lanes open to all drivers 22 hours a day once rules go live.
- Peak windows: Southbound HOV, LEV, and motorcycle only 7 to 9 a.m.; northbound 4 to 6 p.m. weekdays.
- Tolls: No tolls on the technology lanes under the current plan.
What Is Changing on US 75
Before the project, the inside lane on this stretch stayed limited to high-occupancy vehicles and motorcycles for much of the day. That left capacity unused outside rush periods on one of North Texas’s busiest north-south freeways.
TxDOT’s answer is a technology lane, not a toll lane. Broken white striping replaces continuous HOV barriers so cars can move in and out, while overhead signs and a lane-management system enforce the short peak-hour restrictions. The Dallas Morning News reports that new highway safety lighting already covers the full corridor from I-635 to SH 121.
The physical work also changes how the corridor feels at night and during lane changes. Continuous barrier cues give way to more conventional lane markings, so the left lane behaves like a normal through lane except when the peak rules are active.
When Solo Drivers Can Use the Inside Lane
The traveler rule is simple once the project goes live. Outside two weekday windows, any licensed vehicle can use the former HOV lane. On weekends the lane stays open to everyone under the published plan.
Weekday mornings, southbound toward Dallas, the inside lane remains limited from 7 a.m. to 9 a.m. Weekday evenings, northbound toward Collin County, the same limit applies from 4 p.m. to 6 p.m. Those windows still favor high-occupancy vehicles, low-emission vehicles, and motorcycles, according to the City of Richardson project rules cited by The Dallas Express.
That is a shorter restricted day than the old HOV pattern. A solo driver leaving Richardson at 10 a.m., returning from downtown at 2 p.m., or making a Sunday airport run no longer needs to treat the left lane as permanently off limits once the signs match the new schedule.
What Still Has to Happen Before Drivers Rely on It
Major construction is essentially finished, but TxDOT is still evaluating overhead signs and testing the lane-management system. That means travelers should not treat the new access rules as fully live until the department finishes those checks and the signs match the published hours.
Dallas Express reporting on TxDOT’s August 8, 2026 estimate places work completion near 98 percent, with contract time used lower than work progress. The department’s public message in late August is the same direction: wrap-up this fall, then open the lane to solo traffic most of the day.
Until those signs are active, follow whatever is posted in the corridor that day. Construction leftovers, temporary cones, or incomplete overhead panels can still change the legal lane even when the broader project is nearly done.
Who Gains and Who Still Needs to Watch the Clock
Single-occupant drivers gain the most capacity outside rush hour, including midday trips, reverse-commute segments, and weekend travel toward Plano, Richardson, McKinney, and Dallas destinations. For trip planning around the corridor, Deep Arrival’s Dallas things to do guide remains a useful stop for non-driving layover plans after a commute or airport transfer.
Peak-direction carpools keep their priority windows. Drivers who currently time trips to stay legal in the HOV lane should relearn the shorter restricted hours instead of assuming an all-day ban remains. Southbound morning and northbound evening solo drivers will need the new signs more than anyone else.
Low-emission vehicle and motorcycle users still get preferential access in those two peaks. If your eligibility depends on a sticker, placard, or vehicle class, confirm that your status still matches Texas rules before counting on the left lane at 8 a.m. or 5 p.m.
How This Fits North Texas Travel
US 75 remains a primary spine between downtown Dallas, the Telecom Corridor, and Collin County suburbs. Opening the inside lane for most of the day is meant to soak up demand without converting the corridor into another priced managed lane.
That does not erase congestion. It does change the default decision for a solo driver who previously had to stay out of the left lane even at 11 a.m. or 8 p.m. Nearby Grapevine and airport-area travelers who use the corridor as a connector can also plan with Deep Arrival’s Grapevine guide when the drive is part of a wider DFW day.
Local coverage also notes that TxDOT does not currently list another US 75 construction package in Dallas or Collin counties after this conversion. For travelers, that points to a near-term period where the biggest operating change is lane eligibility rather than a fresh multiyear rebuild.
Cost and schedule reporting also frame this as a finishing project rather than a brand-new corridor rebuild. Dallas Express cites an adjusted project projection near $61 million against an original award of about $58.5 million, which helps explain why the remaining public emphasis is signage, testing, and the eligibility flip instead of another year of heavy reconstruction.
| If you are | What to do |
|---|---|
| A solo driver outside 7 to 9 a.m. southbound or 4 to 6 p.m. northbound | Expect legal access to the inside lane once signs and testing finish this fall. |
| Commuting southbound toward Dallas on a weekday morning | Keep treating 7 to 9 a.m. as HOV, LEV, and motorcycle only unless posted otherwise. |
| Heading northbound into Collin County on a weekday evening | Watch 4 to 6 p.m. restrictions and follow the new overhead lane signs. |
| Planning a weekend or midday trip on US 75 | Plan for open access under the published technology-lane rules, with no tolls. |
Rebuild your US 75 lane habit around two short weekday peaks instead of an all-day HOV ban. Confirm the live signs before relying on the inside lane, because TxDOT is still finishing lane-management testing.
Confirmed facts today are the near-complete construction status, the planned 22-hour solo access window, the two weekday peak restrictions, and the no-toll technology-lane design. Exact flip dates for every segment still depend on TxDOT finishing signage and system checks. Drivers should treat “this fall” as the operating window, then verify the corridor on the day of travel.
When can solo drivers use the US 75 inside lane?
Once the project goes live this fall, solo drivers can use the former HOV lane outside the weekday peak windows and on weekends under the published plan.
What are the remaining HOV hours?
Southbound toward Dallas stays limited from 7 a.m. to 9 a.m. on weekdays. Northbound toward Collin County stays limited from 4 p.m. to 6 p.m. on weekdays for HOVs, low-emission vehicles, and motorcycles.
Will the technology lanes be tolled?
No. TxDOT and city project materials describe toll-free technology lanes with peak-hour vehicle-type limits rather than priced managed lanes.
Is the project already finished?
Not fully. TxDOT says work is about 99 percent complete and still testing signs and lane management before drivers should rely on the new rules.
Where does the conversion apply?
The published project covers US 75 from I-635 in Dallas County north to SH 121, also known as the Sam Rayburn Tollway, in Collin County.
