Arrow road for Chinese Magic Track

Arrow road for MagicTrack.
The width of the car 4cm.
Total width of the road 6cm.

I...I.....................I...I thickness=13,5mm


Can be scaled for other model traces. Please inform me the scale coefficient in case of successful printing.
Approximate (untested) scale coefficient for:
I...I.....................I...I thickness=17mm

Kxy = 1,24
Kz = 1,26