|service = parking_aisle|
|A parking aisle is a subordinated way in a parking lot between rows of parking spaces that vehicles use to drive into and out of the spaces.|
|Used on these elements|
|Tools for this tag|
A parking aisle is a service road that passes between one or two rows of parking spaces (amenity=parking_space) in a parking lot or parking garage (amenity=parking or possibly amenity=motorcycle_parking), providing direct access for a motorized vehicle to enter and leave a parking space. It is generally not used for through traffic.
- Arrows painted on the pavement at either end of the parking aisle are all pointed in the same direction. (However, arrows may appear on the pavement for other reasons, such as to direct drivers to a drive-through.)
- The parking aisle isn't particularly wide, and all the parking spaces on both sides are angled to provide easy access coming from one direction but not the other. (However, in some localities, back-in angle parking is common.)
Parking aisles can be reserved for vehicles other than passenger cars, so use the same access tags as the amenity=parking area. For example, the parking aisles in a bus depot would be tagged motorcar=no bus=designated. A parking lot that is reserved for private use and has a "no trespassing" sign would be tagged access=private.
It is common for a fast food restaurant's drive-through (service=drive-through) be nothing more than a painted lane in a parking aisle, with parking spaces to either side. Since the drive-through may pass to the left of oncoming traffic, some mappers treat this situation as an exception to the "physical separation" rule and map the drive-through and parking aisle as two separate ways.
Not every roadway within a parking lot is a parking aisle. Examples are...
- Road connects a parking lot or parking garage to a through street and serves as the entrance or exit of the lot or garage.
- Roadway does not have any parking bays itself.
- Forms the "trunk" or perimeter of the parking lot, connecting multiple parking aisles. There may be parking spaces on either side, but the roadway's primary purpose is to get drivers to another part of the parking lot.
- Primarily provides space for picking up and dropping off passengers – use highway=service service=driveway instead.
Also avoid this tag in the following situations:
- A normal through road that happens to have on-street parking – use parking:lane=* etc.
- An access road that primarily serves a bus station (amenity=bus_station), taxi stand (amenity=taxi) or carpooling station (amenity=car_pooling) – use highway=service with service=driveway or without service=*.
- A driveway that primarily provides direct access to a house, garage, or carport, even if a small number of parking spots is available for occupants – use highway=service service=driveway instead.
- An aisle in a large bicycle parking area (amenity=bicycle_parking) – use highway=footway or highway=cycleway instead.
Mapbox styles show parking aisles, but styles such as Navigation Preview Day omit color-coded traffic congestion along parking aisles to avoid clutter and inaccurate telemetry data on low-volume roads.
As with other kinds of highway=service ways, routers such as OSRM and Valhalla route over parking aisles but generally avoid using them as shortcuts between higher-classed roads. OSRM's default driving profile penalizes parking aisles more than ways tagged with only highway=service – by the same factor as alleys, driveways, and drive-throughs.  In the usual case where a parking aisle is unnamed, guidance instructions may substitute a generic word.