Key:maxspeed:advisory

The maxspeed:advisory=* tag is used to map a posted advisory speed limit which is not legally binding, typically on a curve or motorway on/off ramp. A different legal speed limit may also exist on the same road and be tagged by maxspeed=*.

How to map

By default, values will be interpreted as kilometres per hour. If the speed limit should be specified in a different unit the unit can be added to the end of the value, separated by a space (see Examples).

If the advisory speed limit differs depending on the direction of travel, use maxspeed:advisory:forward=* and maxspeed:advisory:backward=*.

Country specific

Australia

Advisory speed limits in Australia are in black letters on yellow boards. They are generally accompanied by a yellow diamond sign above which gives an image or description of the hazard above. Advisory speed limits in Australia generally end in 5 to distinguish it from legal speed limits, which are posted in white signs with a red ring and is in multiples of 10.

Canada

Advisory speed limits are indicated by yellow signs on freeway on/off ramps and dangerous curves. See for example [1].

Germany

In Germany a speed of no more than 130 km/h (81 mph) is recommended for autobahns and similar roads, whose lanes are separated by a median or which have at least two lanes per direction, provided there are no traffic signs posting a lower speed limit (Richtgeschwindigkeit).[2] On some stretches of roads a lower advisory speed is posted with a rectangular sign with blue background [3]. Motorway links in Germany have an advisory speed of 60 km/h unless otherwise posted.

Scotland

Advisory speed limits are marked with green outline around the number. This is usually in the form of "Twenty's Plenty" signs, usually found in narrow, steep, or twisty residential areas in circumstances which are not extreme enough to be a 20 mph zone.

United States

Advisory speed limits in the United States are posted in miles per hour (mph), and posted in black letters on yellow signs. They are may be used in dangerous curves or freeway/expressway ramps. Freeway or expressway ramps across the U.S. generally have advisory speeds only and no legal speed limits. They are also common along residential streets alongside traffic calming devices such as speed humps (traffic_calming=hump), where both a maximum speed limit and a lower advisory speed limit may be posted. A speed limit of 25 mph with an advisory speed limit of 15 mph is a common combination on residential streets, for example.

maxspeed=25 mph on the railway, not the parallel roadway.

Be advised that some railroads post speed restrictions using the same black-on-yellow sign as an advisory speed limit intended for the roadway.

Examples

Identification	Tagging	Remark
	maxspeed:advisory=35 mph	United States
	maxspeed:advisory=60	Australia

Possible tagging mistakes

maxspeed:advised=*

More details at taginfo

• maxspeed:advised=*

If you know places with this tag, verify if it could be tagged with another tag.
Automated edits are strongly discouraged unless you really know what you are doing!

Related keys

• maxspeed=* for the legal speed limit
• maxspeed:practical=* traveling speed implied by road conditions but not signposted as speed limit or advisory speed limit
• source:maxspeed=* for the source of a speed limit (signposted, road markings, implicit, etc.)