<p></p>
<p dir="auto">I think you're wrong about routing engines as I already explained...</p>
<p dir="auto">OSRM's API is documented <a href="http://project-osrm.org/docs/v5.24.0/api/#requests" rel="nofollow">here</a> and it has a several options like <code class="notranslate">radiuses</code> and <code class="notranslate">snapping</code> relating to matching locations to the routing graph. We don't currently set any of them.</p>
<p dir="auto">Valhalla's API is documented <a href="https://valhalla.github.io/valhalla/api/turn-by-turn/api-reference/" rel="nofollow">here</a> and it has a whole set of parameters like <code class="notranslate">radius</code>, <code class="notranslate">rank_candidates</code> etc that are all about how it matches locations to edges in the routing graph. The only one we currently set is <code class="notranslate">radius</code> which we set to five metres.</p>
<p dir="auto">Graphhopper's API is documented <a href="https://docs.graphhopper.com/#operation/getRoute" rel="nofollow">here</a> and although it doesn't seem to have a search radius it obviously does do snapping because it has parameters like <code class="notranslate">point_hint</code> and <code class="notranslate">snap_prevention</code> which influence the algorithm.</p>
<p dir="auto">So it seems all three routers do in fact do some sort of snapping.</p>
<p dir="auto">It may well be that we could tune the parameters that we pass to some of them better - if you do find better values then please do let us know and we can consider them.</p>

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