There are two new API endpoints that allow you to retrieve the driver(s) of each vehicle for a given time period and vice versa.:

GET /fleet/drivers/vehicle-assignments returns the list of vehicles for each driver over a given time range
GET /fleet/vehicles/driver-assignments returns the list of drivers for each vehicle over a given time range:

See below for sample code for each endpoint:

`GET /fleet/drivers/vehicle-assignments`

curl --request GET 'https://api.samsara.com/fleet/drivers/vehicle-assignments' \
-d startTime='2020-11-01T08:00:00Z' \
-d endTime='2020-11-02T08:00:00Z' \
-G \
--header 'Authorization: Bearer <<token>>'

{
    "data": [
        {
            "id": "1654973",
            "name": "Tyler Freckmann",
            "driverActivationStatus": "active",
            "externalIds": {
                "payrollSys1": "[email protected]"
            },
            "vehicleAssignments": [
                {
                    "isPassenger": false,
                    "vehicle": {
                        "id": "281474977075805",
                        "name": "Little Red",
                        "externalIds": {
                            "samsara.serial": "G9MTH7CNKZ",
                            "samsara.vin": "JTMBK32V895081147"
                        }
                    },
                    "startTime": "2020-11-01T18:16:17.152Z",
                    "endTime": "2020-11-01T18:54:07.996Z",
                    "assignmentType": "driverApp"
                }
            ]
        }
    ],
    "pagination": {
        "endCursor": "",
        "hasNextPage": false
    }
}

`GET /fleet/vehicles/driver-assignments`

curl --request GET 'https://api.samsara.com/fleet/vehicles/driver-assignments' \
-d startTime='2020-11-01T08:00:00Z' \
-d endTime='2020-11-02T08:00:00Z' \
-G \
--header 'Authorization: Bearer <<token>>'

{
    "data": [
        {
            "id": "281474977075805",
            "name": "Little Red",
            "externalIds": {
                "samsara.serial": "G9MTH7CNKZ",
                "samsara.vin": "JTMBK32V895081147"
            },
            "driverAssignments": [
                {
                    "isPassenger": false,
                    "driver": {
                        "id": "1654973",
                        "name": "Tyler Freckmann",
                        "externalIds": {
                            "payrollSys1": "[email protected]"
                        }
                    },
                    "startTime": "2020-11-01T18:16:17.152Z",
                    "endTime": "2020-11-01T18:54:07.996Z",
                    "assignmentType": "driverApp"
                }
            ]
        }
    ],
    "pagination": {
        "endCursor": "",
        "hasNextPage": false
    }
}