You found the perfect lot. The numbers work. Then a traffic study lands on your desk, and your driveway has to move 40 feet. Now the whole site plan needs a redo, and your timeline slips.
This happens more than developers expect. A traffic study can reshape how cars get in and out of your project. It can add lanes, move your entrances or force you to share access with the lot next door. Knowing this early saves real money and a lot of stress.
Here’s what to plan for before you break ground.
Why Traffic Studies Matter Before Commercial Development
A traffic study shows how a new project will affect local roads and intersections. Cities and counties require these studies to check safety and capacity. The report counts current traffic, predicts new trips and flags problems early. Those results guide approvals and can shape your whole site plan.
The study looks at nearby roads and intersections. It checks if they can handle more cars. If your project adds too much traffic, the road may need changes first.
These studies protect public safety. They also protect you. A clear, honest study can speed up approvals and prevent fights with the city later.
Driveway Locations Can Change Based on Traffic Study Results
A traffic study can force you to move your driveway. Engineers check sight lines, car speeds and how close entrances sit to intersections. If a driveway sits in a risky spot, the study will recommend a safer one. That single change can shift your whole layout.
Spacing rules matter a lot here. Most roads need driveways set a minimum distance from corners and other entrances. If your planned access point breaks that rule, it has to move.
Speed and visibility play a big role too. Drivers need enough room to see cars leaving your lot. A blind curve or a steep hill near your entrance can kill your first plan fast.
Turn Lanes and Road Improvements May Be Required
Sometimes a traffic study says the road needs upgrades before your project opens. Common fixes include a new turn lane, a wider road or an updated signal. These improvements often fall on the developer to fund and build.
A left turn lane is one of the most common requests. It keeps turning cars out of through traffic. Without one, the city may hold up your permit.
Signal changes show up too. A busy intersection may need a new light or a longer green cycle. These projects take time and money, so find out early if they apply to you.
Shared Access and Cross-Access Agreements Can Affect Site Design
A cross-access agreement lets cars move between neighboring lots without using the main road. Cities like these because they cut the number of driveways and ease traffic. A traffic study may recommend or require one for your project.
This can reshape your site design. You might need to line up a driveway with the lot next door. You may also need to leave room for a future connection, even if the neighbor hasn’t built yet.
Shared driveways come with legal terms. Both owners agree on upkeep, hours and use. Settle these details before you finalize the layout.
Early Planning Helps Avoid Costly Redesigns
The best time to think about traffic is before you design the site. Early knowledge of likely recommendations saves money. It also keeps your permit on schedule.
A redesign after submittal gets expensive. You pay engineers again, lose weeks and may push back construction. Some developers lose a full building season this way.
Talk to a civil engineer early. Ask for a quick review of access and traffic risk. A short study up front beats a costly fix later.
Frequently Asked Questions
What is a traffic study for a commercial project?
It’s a report that measures how a new development will affect nearby roads. Traffic engineers count cars, predict new trips and test if intersections can handle the load. The study then lists changes needed for safe access.
When should a developer order a traffic study?
Order one early, ideally during due diligence or right after you buy the land. Early results show access risks before you spend money on a full design. Waiting often leads to redesigns and permit delays.
How long does a traffic study take?
Most studies take a few weeks to a couple of months. Timing depends on data needs, city review and how busy the roads are. Complex sites near major intersections take longer.
Who pays for road improvements found in a traffic study?
The developer usually pays. If your project creates the need for a turn lane or signal, the cost often falls on you. Some cities split costs or offer credits, so ask during review.
Can a traffic study stop a project from getting approved?
Yes, if it finds serious safety or capacity problems. Most issues get solved with design changes or road upgrades. A denial is rare when developers plan access carefully and work with the city.