tomhukins
Kikshill Lane is mapped as motor_vehicle=no and highway=unclassified at https://www.openstreetmap.org/way/25475874 but I walked along here today and I think it's signed as a "Byway open to all traffic" at its north end where it joins Blaze Hill (as Jumper Lane) and its south end where it joins Oakenbank Lane and Smithy Lane.  For most of its length, it's probably best classified as a track.