I'm not behind my computer with Racer installed but you could:
open Tracked,
open Carlswood,
zoom in on a cone,
go to "road splines"-mode wich will show the vertices the cone's made up of,
click on a vertice and while holding shift draw a line to the opposite vertice,
in the top left of you're Tracked screen you will find the length of this line.
This way you can measure all dimensions of the cone.