Key:kerb:approach_aid
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Indicates whether a public transport platform has an approach aid. 
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| Group: public transport |
| Used on these elements |
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| Requires |
| Useful combination |
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The key is used to specify whether or not a public transport platform has an approach aid such as Kassel kerb.
An approach aid is a specially formed kerb that helps buses to approach a platform. When the bus is approaching the platform, the curved kerb automatically guides the tires of the bus along the platform. This ultimately helps to reliably minimize the gap between bus and platform, which is crucial e.g. for wheelchair users, people with strollers. The gap width between vehicle and platform determines the difficulty for disabled people to enter a public transport vehicle. Approach aids also reduce tire rub and may prevent wheel hub damage.
How to map
An approach aid should only be tagged on elements with kerb=raised. Tags like kerb=lowered or kerb=flush imply =no. On separate kerb elements =no is assumed though it may be tagged differently (e.g. when the kerb of a platform is mapped separately).
| Type | Crossection | Example Picture | Tagging | Description |
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| Raised kerb without approach aid | 
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There is no approach aid for busses. | |
| Raised kerb with approach aid |  
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The kerb is in some way formed to make it easier for the bus to drive close to it. This must include a rounded bottom (concave fillet) optionally a recess at the top of the kerb may be present. |