Gas Station Site Selection: Why Traffic Counts and Road Speed Determine Feasibility

Gas Station Site Selection: Why Traffic Counts and Road Speed Determine Feasibility

The single most important site-selection metric for gas stations is Annual Average Daily Traffic (AADT) on the adjacent road. Industry analysis identifies a Goldilocks Zone of 5,000 to 15,000 vehicles per day as the optimal AADT range for a convenience store with fuel, though zoning requirements and regulatory compliance must also be verified before committing capital. Below 5,000 AADT, there is insufficient pass-by traffic to sustain typical volumes. A standard 4,500 to 5,000 square foot convenience store with gas generates roughly 2,000 entering and 2,000 exiting vehicles daily, with more than 50% of those trips originating as pass-by traffic. Assuming a high-end capture rate of 1 in 5 drivers, the adjacent road must carry at least 5,000 vehicles per day. Above 15,000 AADT, public agencies increasingly restrict direct property access, and even right-in/right-out configurations become difficult to obtain DOT approval for.

The ideal site sits at the corner of two roads, each carrying traffic within the 5,000 to 15,000 range. Academic research using the Analytic Hierarchy Process confirms that traffic-related factors carry the highest weight in gas station site-selection decisions, with access from both directions, road barricades, road classification, and speed limit on the front road ranking as the top four factors, above environmental, socioeconomic, and physical-land attributes. Average traffic capture rates for gas stations range from 1% to 2% in competitive urban areas to as high as 10% to 15% in favorable locations, depending on visibility, accessibility, traffic signal proximity, competition, and services offered. Rural areas may only support a single store at one out of every ten or so major intersections.

Road Speed Shapes Stop Decisions and Store Revenue

Slower-speed roads generate higher capture rates because drivers have more time to notice a station, make a turn decision, and safely decelerate. Research confirmed that speed limit on the front road is among the most critical factors affecting station success. AASHTO and state DOT access-management principles create a clear mechanism for this relationship: roads with posted speeds of 40 miles per hour or higher require deceleration lanes for commercial driveways, adding substantial cost and design complexity.

Speed also affects in-store spending through dwell time. The average fueling stop takes 2 to 3 minutes for a fill-up, but 73% of fuel app users spent more than 5 minutes on-site in Q1 2017, and 55% exceeded 5 minutes in Q1 2019, indicating willingness to enter stores. Average dwell time rose 14% quarter-over-quarter in Q3 2018. Drivers on lower-speed roads are more likely to be making local trips with time flexibility, increasing the probability of in-store purchases versus fuel-only stops.

Ingress and Egress Design Requirements Escalate With Speed

State DOT driveway design standards impose increasingly costly requirements as road speeds rise. Georgia DOT requires acceleration lanes when posted speed is 40 mph or greater. Iowa DOT applies AASHTO principles requiring that driveways should not be located within the functional area of an intersection, with upstream functional distance calculated as perception-reaction distance plus deceleration distance plus a 50-foot minimum queue storage. Maryland DOT bases full deceleration lane lengths on AASHTO speed-change design plus transition tapers plus queuing length, with lengths varying by posted speed. New York State DOT may require developers to construct acceleration/deceleration lanes, through or turning lanes, traffic signals, extended throat lengths, or service/access roads as mitigation.

At AADT levels above 15,000, even limited right-in/right-out access becomes difficult to obtain DOT approval for because the road is classified as an arterial or highway subject to strict access management. AASHTO driveway spacing standards require minimum separation at no less than stopping sight distance, with roads carrying 10,000 to 24,000 AADT corresponding to five-lane two-way left-turn lane design.

Corner Lots, Traffic Signals, and the Going Home Side

Signalized corner (hard corner) locations command premium values in gas station real estate. Industry listings consistently describe signalized hard corner as a premium attribute. Proximity to traffic signals increases capture rates because signals create natural deceleration and stopping points, giving drivers time to notice and decide to enter a station.

The going home side of the road concept is fundamental to fuel retail site selection. Industry research found that location is among the top two considerations when consumers choose a fuel station, and consumers will pay more to avoid turning into an area with difficult entry/exit. Most drivers are willing to pull into a station on their right side when heading home (PM commute direction) but are far less willing to make a left turn across traffic for a quick stop, explaining why two gas stations of the same brand can exist at the same intersection, each capturing a different traffic direction.

Interstate exit locations cater primarily to through-travelers with higher fuel volumes but potentially less convenience store traffic. Urban arterials with moderate speeds (25 to 45 mph) benefit from regular commuter traffic and walk-in customers. Businesses serving pass-through traffic, including gas stations, convenience stores, and fast food, are most vulnerable to highway bypass effects.

How DOTs Measure Traffic and What AADT Misses

AADT is measured through two primary methods. Continuous count stations use permanent sensors embedded in the road to collect 365 days of data, with AADT calculated as total annual volume divided by 365. Short-term expansion methods deploy temporary counters (typically pneumatic road tubes) for 2 to 14 days, then scale data using seasonal and day-of-week adjustment factors from nearby permanent counters. FHWA recommends short counts on each road segment at minimum every three years. Each state DOT publishes AADT maps online. Commercial providers offer GPS-validated AADT analytics using data validated against 1,724 or more permanent counter locations in collaboration with FHWA and 18 state DOTs.

Critical limitations for gas station site selection include the following: AADT represents a bidirectional annual average that does not capture peak-hour variations, seasonal fluctuations, or directional splits. Coverage gaps exist because permanent counters on every road are cost-prohibitive, meaning low-volume and local streets often have estimated or outdated counts. Special events, weather, and construction can distort averages.

Fuel Margins, Revenue Breakdown, and the Convenience Store Profit Engine

Total U.S. convenience store sales (fuel plus in-store) reached $837.4 billion in 2024, down from $859.8 billion in 2023. Total fuel revenues fell 5.7% to $501.9 billion, while in-store sales hit a record $335.5 billion, up 2.4% and marking the 22nd consecutive year of record in-store performance. Average gas price was $3.31 per gallon in 2024, down 6.5% from $3.55 in 2023.

Fuel represents approximately 60% to 62% of total revenue but only about 39% of gross profit dollars. In-store sales, at 38% to 40% of revenue, generate 60.7% of gross profit dollars. Convenience store sales account for roughly 30% of revenue but approximately 70% of total profits. Major operators reported fuel gross margins ranging from 30.5 cents per gallon to 47 cents per gallon in 2024, depending on the chain. After all expenses, net profit per gallon is approximately 1 to 3 cents. An average station selling approximately 4,000 gallons per day ($12,000 to $16,000 in fuel revenue) nets only roughly $120 to $280 daily in fuel profit.

Foodservice has become the growth engine, rising from 11.9% of in-store sales in 2004 to 28.7% of in-store sales and 39.6% of in-store gross margin dollars in 2024. National average basket size is $7.83. Average sole proprietor gas station annual revenue exceeds $1.3 million based on tax return data, with well-run stations achieving net profit margins of 3% to 5% combining fuel and convenience store operations.

How Appraisers and Lenders Evaluate Traffic for Feasibility

SBA regulations authorize the agency to require professional appraisals, surveys, or feasibility studies for all business loans. Both SBA 7(a) and 504 programs commonly require feasibility studies for gas station new construction, expansion, or startup businesses. SBA 504 structure: conventional lender provides 50%, SBA covers 35% through a CDC, and borrower contributes 15% down payment for special-use properties like gas stations. SBA guarantees up to 85% of loans under $150,000 and 75% above that amount. The average SBA gas station loan is approximately $1.9 million. Typical feasibility study cost ranges from $6,500 to $20,000 depending on complexity.

Feasibility studies include traffic and customer analysis (AADT, peak-hour patterns, capture rates), fuel sales and retail revenue projections (in-store sales per SF, gallons per day), competitive landscape profiling, 10-year financial pro formas, debt service coverage ratio (DSCR) analysis, environmental assessment (especially underground storage tank risks), and market/demographic analysis. The key lender metric is DSCR, meaning the study must demonstrate projected cash flow can cover loan payments plus owner's salary. SBA emphasizes prior experience of borrowers; inexperienced buyers typically need a partner with direct management experience.

Trade Area Methodology Differs for Fuel Retail

A novel methodology defines three distinct trade area elements for convenience stores and gas stations. The Immediate Trade Area (1 to 2 miles) captures local visitor demographics. The Extended Trade Area (5 to 20 miles) captures regional customers whose visitation depends on site accessibility and competition. Passing Traffic captures actual visitors via traffic flow data, while the other two indicate location potential. Traditional methods like distance rings and drive-time polygons often fail to capture the dynamic nature of customer behavior, traffic flow, and demographic composition for convenience stores and gas stations, which depend more on passing traffic than local population.

The industry includes 152,255 convenience stores in the U.S. as of 2025, with 121,852 selling fuel, an increase of 1,791 fuel-selling locations over 2024. Approximately 60% are single-store operators. Convenience stores process 165 million daily transactions and account for 16% of all consumer packaged goods sales and approximately 80% of all fuel purchased in the United States.

EV Charging Reshapes Station Economics and Dwell Time

EV charging extends customer visits dramatically, with an average of 23 minutes for EV charging versus 5 minutes for gas. EV owners enter convenience stores 45% more often than gasoline customers, with average food spend up 25%. One study found that opening a charging station in California boosted annual spending at each nearby business by approximately $1,500 in 2019 and about $4,000 by recent measures. Approximately 65% of NEVI (National Electric Vehicle Infrastructure) program funding recipients are already fuel retailers.

Global EV sales exceeded 17 million in 2024, representing over 20% of total vehicle sales worldwide, with U.S. EV sales at approximately 10% of total. However, real-world EV charging reliability remains a challenge, with only 71% of charging attempts succeeding despite vendors reporting 98% or higher uptime. EV drivers will pay premiums greater than 10% for trusted, reliable, well-lit charging locations with amenities. The global EV charging value pool is estimated at $120 to $180 billion by 2030.

Failed Gas Stations: Bypass Effects and Access Disasters

Highway bypass effects devastate travel-dependent businesses. Research found bypasses led to 15% to 20% decreases in restaurant sales and 25% to 55% decreases in gasoline sales. Other studies found 15% decreases in gasoline sales and 10% to 15% decreases in restaurant sales in smaller cities after bypass construction. Declines were especially pronounced along the bypassed route or old highway with heavy business relocation from old routes to bypass routes. A 2021 bypass feasibility study for Sandy, Oregon specifically identified gas stations and convenience stores as businesses that would likely be impacted by traffic diverted away from town.

The number of gas stations in the U.S. declined from approximately 195,000 in 1995 to roughly 115,000 today as consolidation and competition eliminated weaker operators. The 2025 convenience store count edged down 0.1% to 152,255.

Implications for Feasibility and Valuation

Traffic analysis is the foundation of gas station feasibility. The 5,000 to 15,000 AADT Goldilocks Zone defines the viability window, road speed determines capture rate potential, and ingress/egress design shapes both development cost and long-term customer accessibility. For lenders and appraisers, the key takeaway is that AADT alone is insufficient. A comprehensive feasibility study must account for directional splits, peak-hour patterns, speed-related capture rate adjustments, competitive saturation within the trade area, and the increasingly critical convenience store revenue model that generates 70% of profits from 40% of revenue. The structural shift toward foodservice (now 28.7% of in-store sales, up from 11.9% in 2004) and the emerging EV charging opportunity (23-minute dwell times versus 5 minutes for gas) are fundamentally altering what makes a gas station site viable, rewarding locations that optimize for dwell time and in-store conversion rather than fuel throughput alone.

For lenders and investors evaluating projects in this sector, UnionMetric provides independent feasibility analysis services that meet SBA and USDA requirements. For how a site's fuel volume risk is priced over a loan longer than any credible forecast, see gas station feasibility and EV exposure across a 25-year term.

For the cross-asset framework, demand regimes, valuation methods and reviewer tests, see the 2026 Feasibility Methodology Atlas.

Sources

1. NACS, State of the Industry Report 2024-2025
2. Tuzmen and Sipahi, A Multi-Criteria Factor Evaluation Model for Gas Station Site Selection, Journal of Global Management, 2011
3. CStore Decisions / Spack Consulting, Selecting an Optimal Location for Your C-Store, 2017
4. AASHTO, A Policy on Geometric Design of Highways and Streets (Green Book), 7th Edition, 2018
5. Iowa DOT, Design Manual Chapter 5 Roadway Design Section 5L Access Management
6. FHWA, Traffic Monitoring Guide, 2013
7. GasBuddy/Cuebiq, Foot Traffic Report for the Fuel and Convenience Store Industry, 2017-2019
8. Casey's General Stores, Murphy USA, and ARKO Corp, SEC Filings 2024-2025
9. MIT News, Study: EV Charging Stations Boost Spending at Nearby Businesses, September 2024