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If you are developing a property on a roadway that is controlled by the Texas Department of Transportation (TxDOT) and want to maximize access, you will have to consider TxDOT standards on driveway spacing. This is one of the criteria that TxDOT will assess your access driveway permit application.
We often are taught to keep a “two second distance” between ourselves and the car in front of us. The intention is that we will have the distance and time to react should they behave unexpectedly. But this is an overgeneralization, since a driver’s reaction time and their appropriate stopping distance varies not just with the speed which you and the rest of traffic are going, but also physical factors such as the effectiveness of your vehicle’s brakes, incline or the road, traction, and other conditions.
Traffic and transportation engineering takes many variables and produces a design that keeps you and I safe on the road. These design principles become design criteria much like TxDOT’s access road and driveway spacing requirements.
The distance between driveways are measured from the edges of pavement of the driveway, prior to the return radius.
How far your access roads and driveways will need to be designed varies directly with the type of road your development lies on and the posted speed (this varies from a roadway design speed, which can often be higher than the speed limit). Let’s break it down by road type:
These distances assume the highway approach to the driveway is on level grade. If there is a downslope or upslope present, the permitting team my require a greater or lower spacing distance.
TxDOT further divides its jurisdiction into districts, that are given authority to amend these rules as needed for their regions. The department also enters into agreements with some municipalities to create special access standards that are more appropriate to their local communities.
If your development cannot meet these minimum requirements, then a variance may be required. The variance process is initiated during the driveway application process and is approved by the TxDOT permitting team. A variance often comes with special performance or design criteria for the driveway and development in question. Emergency access driveways and field driveways are also permitted on a case by case basis.
There are two automatic exceptions from spacing requirements:
If you are developing a property and need assistance securing an approved permit for an access driveway on a TxDOT Right of Way, our traffic engineering and site development permitting experts can prepare and expedite your permitting process. Contact WGI at 1-877-733-3642 or click here to send us a message.
This article originally appeared on Building Bayou City.
WGI is a national design and professional services firm leading in technology-based solutions for the construction of public infrastructure and real estate development. At WGI, we’re providing Tomorrow’s Infrastructure Solutions Today.
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