Warehouse aisle width: the INRS ED 6002 figures to follow

There is no single legal width for a warehouse aisle: the figure depends on the vehicle, the direction of travel, and whether it crosses paths with pedestrians. Based on INRS guidelines (fact sheet ED 6002), a one-way aisle is calculated as follows: width of the loaded vehicle + 1 m safety margin; for two-way traffic, add both vehicle widths + about 1.40 m. For a single pedestrian, 0.80 m is enough; allow 1.50 m where crossing paths is possible.

What INRS ED 6002 recommends for warehouse aisle width

The INRS ED 6002 fact sheet (design of workplaces and layouts, traffic plans) does not set any single, legally enforceable width for a warehouse aisle. It does, however, provide a method and orders of magnitude, echoed by industry professionals (fcca.fr, Mecalux, u-light.fr).

The core principle: an aisle's width depends first on the size of the widest vehicle that must travel through it (the forklift or the load it carries, whichever is bulkier), then on a fixed safety margin that protects the operator, the racking structures and any pedestrians present.

This logic applies just as much to a conventional forklift as to a manual, electric or autonomous pallet truck. It directly shapes the traffic plan layout, floor marking (French decree of 4 November 1993) and, upstream, the choice of racking type.

Warehouse aisle width table by vehicle type and use

Here are the orders of magnitude generally used, based on the INRS ED 6002 method. These are design benchmarks, to be validated in your risk assessment (DUERP) according to your actual vehicles and their technical specifications.

These figures confirm a simple principle: the more a forklift needs to maneuver to pick up a pallet (turning, reversing, blind spots), the wider the aisle must be. Conversely, a vehicle guided or piloted by sensors (rail, laser, onboard AI) can operate in a much narrower warehouse aisle, which has a direct impact on storage density.

Calculation method: vehicle width + safety margins

To size an aisle without relying solely on the table above, apply the INRS ED 6002 calculation method to your own fleet of vehicles.

One-way traffic

The base formula used by INRS is:

Aisle width = width of the loaded vehicle (or of the load, if it is wider) + 1 m safety margin.

This 1-metre margin covers the driver's trajectory deviations, protection of the racking uprights, and a minimal clearance if a pedestrian occasionally needs to walk alongside the aisle.

Two-way traffic

When two vehicles need to be able to cross paths in the same aisle, the formula becomes:

Aisle width = (2 x width of the loaded vehicle) + about 1.40 m of central margin.

This doubling explains why most warehouses opt for one-way traffic in dense storage aisles, and reserve two-way traffic for main circulation aisles.

Pedestrians

If pedestrians need to cross paths with forklifts in the same area, INRS recommends physical separation (marking, bollards, dedicated aisles) rather than simply sharing the width. A single-pedestrian passage should be sized at 0.80 m, and 1.50 m as soon as crossing paths is possible.

The special case of autonomous robots like the robot

Autonomous pallet-handling robots change the equation for warehouse aisle width, because their approach to picking up a load differs from that of a forklift operator.

The robot, a fully autonomous pallet truck, is documented for a 90° pallet pick-up in 2 m aisles, with a minimum spacing of 15 cm between adjacent pallets and a correction tolerance of up to 15 cm of offset and 15° of angle, thanks to its 3D LiDAR and VSLAM navigation. Its overall dimensions are 1,585 x 910 x 1,870 mm, with standard forks 620 mm wide (550 mm in the narrow version).

Unlike a forklift operator who must turn, reverse and correct their trajectory by eye, an autonomous robot perceives its surroundings at 360° and recalculates its path in real time. It therefore doesn't need the maneuvering margin that a conventional front-loading forklift requires for a U-turn or an angled pallet pick-up. This is what allows this type of vehicle to operate in narrower aisles than a front-loading forklift, without the floor-guidance constraints of a wire-guided three-way forklift.

This point is central to any automation project that avoids infrastructure work: a warehouse already sized for picking or an electric pallet truck may, depending on its existing aisle configuration, be compatible with an autonomous robot without a major overhaul of the traffic plan.

Aisle width and racking choice: a shared trade-off

Warehouse aisle width and racking type are always decided together, since each storage configuration imposes or frees up circulation width.

• Conventional racking (standard pallet racking): direct access to each pallet, but requires one aisle per row sized for the forklift used (front-loading or reach truck).
• Accumulation racking (drive-in/drive-through): a single central aisle serving several storage depths, maximising density at the cost of selectivity.
• Mobile racking on rails: a single service aisle open at a time, a significant space saving but higher equipment cost.
• Very narrow aisle storage (VNA): three-way forklifts or guided robots, aisles under 2 m, maximum density but more demanding equipment and guidance.

Reducing aisle width mechanically increases the surface area available for storage, but requires more specialised handling equipment, whether wire-guided or autonomous. This is a trade-off to make upfront, alongside the choice of racking type and handling method.

FAQ

What is the minimum width of a warehouse aisle?

There is no single minimum legal width. INRS ED 6002 recommends calculating warehouse aisle width based on the widest vehicle that will travel through it: the loaded forklift's width + 1 m for one-way traffic. For a guided three-way forklift, the width can drop below 2 m.

What is the width difference between a front-loading forklift and a three-way forklift?

A front-loading forklift must turn to pick up a pallet, which requires 3 to 4 m of aisle. A three-way forklift, guided along the floor or by rail, shifts its forks sideways with no maneuvering and can operate in an aisle under 2 m, nearly doubling storage density.

Does an autonomous robot like the robot need wider aisles than a forklift?

No, quite the opposite. The autonomous pallet truck is documented for a 90° pallet pick-up in 2 m aisles, thanks to its 360° perception and real-time trajectory correction, without the turning margin a conventional front-loading forklift needs when maneuvered by an operator.

How do you calculate the width of a two-way aisle?

The INRS formula used is: twice the width of the loaded vehicle, plus about 1.40 m of central margin. This is why most warehouses reserve two-way traffic for main circulation aisles and favour one-way traffic in dense storage areas.

Is aisle width a precise regulatory requirement?

No, INRS ED 6002 provides a method and design benchmarks, not a legally enforceable figure. The chosen width should be recorded in the warehouse's traffic plan and based on the risk assessment (DUERP), taking into account the vehicles actually used on site.

Related reading

• Types of warehouse racking: choosing the storage configuration suited to your aisle width.
• autonomous pallet truck: full overview: detailed specs of the autonomous pallet truck mentioned in this article.
• Europe pallet dimensions: the basis for calculating the loaded footprint when sizing your aisles.
• Automating a warehouse with no conveyors or construction work: how an autonomous robot fits into an existing traffic plan.
• DUERP in the warehouse: the 10 risks not to overlook: factoring aisle width into your risk assessment.
• Traffic plan in a warehouse with a mobile robot: the method, beyond aisle width alone.
• Warehouse floor and handling equipment: flatness, slopes and thresholds, the other physical parameter to check before a mobile robot.

Considering an autonomous pallet truck in your existing aisles

Before undertaking work to widen your aisles, it's often worth checking whether your current traffic plan is already compatible with an autonomous handling robot like the robot. Easy to Carry, the French distributor of the robot, can assess feasibility with you based on your existing aisles. Discover the autonomous pallet truck or request the free site pre-assessment: a written verdict within 48 business hours on your aisles.