The <b>Valhalla Expansion</b> algorithm returns street edges reachable from a start location within the specified intervals (analogous to isochrones/isodistances).

Specify points and/or polygons to be avoided with the <i>avoid locations</i> / <i>polygons</i> parameters.
The output layer is a table layer with the attributes <i>durations</i>, <i>distances</i>, and <i>ID</i>.

Valhalla has a dynamic cost model. You can set an extensive amount of costing options in the <b>Advanced Parameters</b> section. Refer to
<a href="https://github.com/valhalla/valhalla/blob/master/docs/api/turn-by-turn/api-reference.md">the documentation</a> for an in-depth explanation.
