isochrones

Currently the layer cannot be selected for low zoom levels.

just realized that truck routing doesn't care about the use_highways option. I didn't do an extensive review what else might be missing, on a quick scan it's at least:

• highway factor
• surface factor

labeling as bug since it's not expected behavior reading the documentation

Here's what I did

 [-0.0743414, 51.5015841],
 [-0.05273140000000039, 51.46430039999999],
 [-0.0531279, 51.4637

Example metadata

{
    "metadata": {
        "attribution": "openrouteservice.org | OpenStreetMap contributors",
        "service": "matrix",
        "timestamp": 1632652598861,
        "query": {
            "locations": [
                [
                    9.70093,
                    48.477473
                ],
                [
                    9.207916,