We're currently investigating in the HERE Routing API v8 but can't really determine what the actual result consists of when units is set to metric.
Example result:
"summary": {
"duration": 1670,
"length": 12865,
"baseDuration": 1506
},
"transport": {
"mode": "truck"
}
Would the length be in metres perhaps? And what about the duration? Is that in seconds?
Please find the following parameters along with their units of measurement
duration: required integer (Duration) Duration in seconds.
length : required integer (Distance) >= 0 Distance in meters. For more information please refer to the following API Reference