lagcisco ,
Length of the tape can be anything, from one car width to 10 meters.1.5mm tape can be taped onto the tarmac ( onroad track), carpet tolerates the 3mm tape fairly well ( the 1.5 practically undetectable under it), anything thicker can be bridged over the track, just like the ILap system, or can be dug into the surface of the track, if it is possible , like in a dirt, or a clay track. For offroad use, you can use the thickest tape ( 6mm), and that will have 125mm detectable range ( it is more than this, but we'd like to stay on the conservative side of our recommendations). If you need more range, then you can use 2 strips by doubling them up, almost doubling the detection range.

Please refer to the chart for actual distances below, under Magnetic Tape Specifications:
https://cloudlaps.com/specification/