# Isochrones for emergency vehicles -\> increase travel speed
**URL:** https://ask.openrouteservice.org/t/isochrones-for-emergency-vehicles-increase-travel-speed/4695
**Category:** isochrones
**Created:** [March 23, 2023, 5:57pm UTC](https://ask.openrouteservice.org/t/isochrones-for-emergency-vehicles-increase-travel-speed/4695 "2023-03-23T17:57:22Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@sschll](https://ask.openrouteservice.org/u/sschll)
#### Post date: [March 23, 2023, 5:57pm UTC](https://ask.openrouteservice.org/t/isochrones-for-emergency-vehicles-increase-travel-speed/4695/1 "2023-03-23T17:57:22Z")
Hi,
I’m working on a project to calculate isochrones which represent the response area of emergency vehicles in a specified time window.
For this, I set up my own docker instance of ors and use the API for the isochrone calculation (base\_url=‘localhost:8080…’).
In order to get more realistic isochrones for the (different) emergency vehicle, I want set the speed limit for different kind of streets higher, as well as increase the average travel speed.
Is there an easy way to configue a profile for the emergency vehicle, neglecting the OSM speed limits or increase these, and use it in my local ors build?
I read, that ors only uses it’s own speed limits secondary if no OSM data for a path is given. Maybe there is a possibility of increasing the OSM speed limits with a scale factor?
Thanks in advance for your help.
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### Author:  [@jschnell](https://ask.openrouteservice.org/u/jschnell)
#### Post date: [March 24, 2023, 7:59am UTC](https://ask.openrouteservice.org/t/isochrones-for-emergency-vehicles-increase-travel-speed/4695/2 "2023-03-24T07:59:31Z")
Hey,
have a look [here](https://ask.openrouteservice.org/t/average-speed-for-isochrones-emergency-vehicles/1521/3) as this is rather closely related.
Best regards