GIS Products:

The Iowa Road Conditions data is available in the following GIS formats and Open-GIS based web services. Please let us know if you would like to see a different format or have any questions about these data sources.

Shapefile:

Line coverage shapefile in the NAD83 UTM Zone15 North projection.

Google Earth / KML

This file is in KML format, which works in many applications, such as Google Earth.
https://mesonet.agron.iastate.edu/kml/roadcond.kml

Also, here is a test layer you can use to see the various colors used.
https://mesonet.agron.iastate.edu/kml/roadcond.php?test

Open GIS Consortium Web Services:

Some intelligent GIS platforms are able to consume data from remove servers that implement Open GIS Consortium web services. If your client supports this feature, try pointing your application to one of these services.

Web Map Service:
https://mesonet.agron.iastate.edu/cgi-bin/wms/iowa/roadcond.cgi?