The road obligation is a method, not a number

Ask what the offsite road work costs and you will get a number. The number is downstream of a method, and the method is the thing to ask about first.

Offsite roads get carried in most early budgets as a single allowance. One line, one figure, usually a round one. That line is doing a lot of work, because jurisdictions arrive at road obligations in at least three different ways, and the three produce very different exposure on the same site.

Method one: the named list

Some towns write the improvements into the conditions, item by item. A Holly Springs rezoning carried a set of commitments naming individual signals at named intersections, a 200 foot northbound right turn lane with appropriate taper at one of them, and a 200 foot eastbound right turn lane with a 150 foot westbound left turn lane at the site access. Not an allowance. A build list with storage lengths in it.

The advantage is that you know exactly what you owe. The risk is that the list is written before the engineering is finished, and it binds you to items whose cost you discover later. A named turn lane is a commitment to whatever that turn lane turns out to cost, including the utility relocations and the drainage nobody priced when the condition was drafted.

Method two: the computed share

Other jurisdictions run it through the traffic study and hand you a percentage. In a 2026 York County, South Carolina development agreement, the traffic impact analysis found streets in the study area already operating below the required level of service, concluded those streets would carry additional demand attributable to the project, and set the developer’s responsibility at 31 percent of the recommended improvements.

Two things are worth pulling out of that. The first is that the improvements are described as background infrastructure improvements, meaning the road was already failing before this project existed. You are buying a share of an existing problem, not just the marginal effect of your own trips.

The second is that 31 percent is calculated rather than negotiated. That cuts both ways. It is harder to talk down, and it is also harder for the number to grow on you, because it is tied to a study with a method behind it. Of the three approaches this is the one where an early estimate is most likely to survive to closing.

Method three: the cash alternative

Fee in lieu is the method everyone hopes for, and it is real. Fuquay-Varina approved a fee in lieu of roadway improvements along a property frontage at $27,776 in February 2023. Apex has written the option directly into conditions, allowing a developer to pay a fee in lieu of building a thoroughfare widening.

Read the qualifier, though. In the Apex case the alternative is subject to review and approval by the Director of Transportation and Infrastructure. Fee in lieu is generally a discretionary option offered by a named official, not a right you can elect. Underwriting the cash figure when the town has not agreed to accept cash is a common and expensive assumption.

The obligation does not stop at your property line

This is the part that has no ceiling in it. A 2025 Apex condition made the developer responsible for acquiring all offsite easements and right of way necessary to build the committed transportation improvements. If the developer cannot get them through good faith efforts, it may ask the Town for assistance. If the Town is unwilling or unable to help, the developer updates the plans and pays a fee in lieu based on the fair market value of what it could not acquire.

That is a reasonable drafting solution to a real problem, and it is also an obligation to negotiate with strangers who have no reason to sell, on a schedule set by your own approvals. The eventual fee in lieu is defined by fair market value, which is to say it is not defined at the time you sign.

The dedication is certain, the road is a maybe

Dedications are driven by adopted plans rather than by funded projects. Morrisville’s comprehensive transportation plan, adopted in 2019, sets future ultimate roadway cross sections for all roads in the town. That ultimate section is what your frontage gets measured against, whether or not the widening has money, a design, or a date.

Corridor plans sit on shelves for twenty years and longer. So the honest underwriting position is asymmetric on purpose: price the obligation as a certainty, and treat the road itself, and any value uplift it would bring, as an unknown. A frontage road that currently connects to nothing, on an alignment that will be redrawn several more times before it is built, is a cost you fund against pads that cannot yet be priced for it.

One watch item

Offsite right of way acquisition has been a legislative target. House Bill 765 in the 2025 North Carolina session included language providing that a city shall not require an applicant to acquire right of way from property the applicant does not own, while allowing an applicant to agree to do so voluntarily. As of a legislative update to the Carrboro council in November 2025 the bill had not passed, and staff expected it to return under a different number.

Worth watching rather than relying on. If the rule changes, the offsite acquisition condition above is exactly the kind of term it would reach.

What to do with this

• Ask which method the jurisdiction uses before you ask what the number is. Named list, computed share, or cash alternative each behave differently under stress.
• If it is a named list, get the list priced by an engineer, not by an allowance. The storage lengths are in there for a reason.
• If it is a share, find out whether the study is done and who accepted it. A percentage of an unpriced improvement list is not yet a number.
• If it is fee in lieu, find out who signs it and whether they have signed one recently. Discretion that has never been exercised is not an option.
• Read the adopted transportation plan for the ultimate cross section on your frontage, then ask whether the project is funded. The first number drives what you give up. The second drives whether you ever get anything back.
• Find every obligation that lives off your own property and price it separately, because those are the ones without a ceiling.

The traffic study tells you what the road needs. The method tells you what you owe. They are not the same document and they rarely arrive at the same time.