Bollard spacing is application-driven: storefront protection uses 4-foot centers, drive-thru lanes use 5- to 6-foot centers, ADA pedestrian paths require a 36-inch minimum clear opening, and K-rated perimeter lines must match the spacing in the manufacturer's ASTM F2656 certified configuration. Cojo set 5-foot center-to-center spacing on a 14-bollard storefront-and-drive-thru combination at a Salem QSR in March 2026 -- a hybrid layout where storefront posts ran tighter than the drive-thru posts to handle different threat profiles. This guide breaks down the math for each application.
For category context, see our What Are Bollards hub. For the basic spacing question, see How Far Apart Should Bollards Be Placed. For drive-thru-specific specs, see Bollards for Drive-Thru Lanes.
What's the Right Bollard Spacing for Storefront Protection?
Storefront bollards face slow-speed ramming as the primary threat -- vehicle-into-store events typically occur at 5 to 25 mph. The U.S. National Highway Traffic Safety Administration crash data and FBI vehicle-as-weapon trend reports document the prevalence of low-speed accidental and intentional storefront strikes.
Standard storefront spacing:
- 48 inches on center -- most common spec for retail facade protection
- 42 inches on center -- tighter spec for high-risk facades or larger bollard diameters
- 60 inches on center -- looser spec where bollard diameter compensates (8 inch and larger pipe)
The clear opening should fall between 36 and 48 inches. Below 36 inches, ADA pedestrian access fails. Above 48 inches, a passenger vehicle can fit between adjacent posts.
How Wide Should Drive-Thru Bollard Spacing Be?
Drive-thru lanes need wider spacing because vehicles must pass between bollards. The lane width itself is set by the queue design and the largest expected vehicle.
| Drive-Thru Type | Lane Width | Bollard Spacing |
|---|---|---|
| QSR / fast food | 10 to 12 ft | 6 to 8 ft on center |
| Bank ATM | 9 to 11 ft | 5 to 7 ft on center |
| Pharmacy | 10 to 12 ft | 6 to 8 ft on center |
| Service bay entry | 12 to 14 ft | 7 to 10 ft on center |
What ADA Spacing Rules Apply?
The U.S. Access Board ADA Standards Section 403.5 sets the floor for any pedestrian path that crosses a bollard line.
- Minimum clear width: 36 inches between inside faces of adjacent bollards
- Passing space: 60-inch wide space at intervals of 200 feet on long runs
- Cane detection: Bollards meet ADA cane-detection requirement at 27 inch height with no protrusions over 4 inches
- Curb-ramp landings: No bollards in the 36 by 36 inch level landing area
For broader ADA design issues, see our ADA parking requirements Oregon service guide.
Why Does Cane-Detection Height Matter?
Bollards under 27 inches above grade are not detectable by a person using a white cane in standard sweep technique. The 27-inch threshold appears in ADA Standards Section 307.2 for protruding objects. Most parking-lot and storefront bollards exceed 27 inches by design (typical 36 to 42 inch above-grade height), so the rule is rarely a constraint -- but flush parking blocks and very short decorative bollards can fail it.
What Spacing Does K-Rated ASTM F2656 Require?
K-rated bollards have configuration-specific spacing. The ASTM F2656 certification process tests a bollard line with specific bollard centers under live-fire crash conditions. Field installation must match the tested configuration.
Common manufacturer-certified spacings:
- K4 / M30 fixed -- 48, 60, or 72 inches on center
- K8 / M40 fixed -- 48, 54, or 60 inches on center
- K12 / M50 fixed -- 36, 48, 54, or 60 inches on center
- K-rated retractable -- per certified group configuration, typically 60 inches on center
Spacing wider than the certified configuration creates a vehicle-passable gap and voids the rating. Spacing tighter is allowed and conservative. The U.S. Federal Highway Administration Roadside Design Guide references the F2656 rating system for federal-property perimeter applications.
How Do Other Applications Map to Spacing?
The full application matrix:
Fire Lane Marking
8 to 10 feet on center is the standard for fire-lane channelization. Removable lockable bollards allow fire-truck access. NFPA 1 Fire Code, adopted by most Oregon jurisdictions, requires fire access lanes to remain unobstructed but allows controllable barriers (bollards with breakaway or removable design) to manage routine vehicle traffic.
Bike Rack and Pedestrian Channelization
6 to 8 feet on center provides flow management without point-blocking. Tighter spacing is unnecessary because the threat is vehicle entry from a single direction, not free-form ramming.
Parking-Lot Perimeter
5 to 6 feet on center is typical for parking-lot perimeter protection. Tighter spacing is justified at vehicle approach angles where ramming-energy is concentrated.
School Zone and Crosswalk
Per local jurisdiction. Many Oregon districts follow Federal Highway Administration School Travel Plan and Manual on Uniform Traffic Control Devices guidance, which references 5 to 8 foot bollard spacing for school-zone vehicle separation.
Government Building Perimeter
K-rated per facility security spec. Federal facilities follow GSA Interagency Security Committee guidance, which is configuration-specific to the threat assessment.
For city-specific application work in Salem where Cojo handles bollard layout for retail and government contracts, see Bollard Installation Salem. For the test-cert details, see ASTM F2656 Bollards Guide.
What's the Real Cost of Wrong Spacing?
Three failure modes show up at sites with bad spacing:
- ADA non-compliance. A federal Department of Justice complaint or settlement can range $5,000 to $50,000 per site, plus required corrective work.
- K-rating void. Insurance and security audits require certified configuration. Field-modified spacing voids the certification, requiring removal or recertification.
- Vehicle penetration. Spacing wider than 48 inches with a 6-inch bollard allows a passenger vehicle to fit through, defeating the protection purpose.
Each failure can be avoided by laying out the bollard line with the application matrix in hand and verifying clear openings before drilling.
Get a Site-Specific Spacing Layout
Bollard spacing math is application-driven and code-bounded. ADA, ASTM, and local jurisdiction requirements all interact on a multi-zone site. Cojo specs bollard layouts across Oregon for storefront, drive-thru, parking-lot, and government applications, including code-compliance verification before install. Contact Cojo for a site-specific layout review.