a few questions

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Naughty Alien

..as I can see you defining X,Y,Z position of CAR entity in 3D space and assigning new recalculated possitions to it..now (:) sign representing first line of code what will be executed after previous one...in another words if you want to see your code without (:) sign, it will be like this

;calculate car velocities
cx#=EntityX( car )
x_vel=cx-prev_x
prev_x=cx

cy#=EntityY( car )
y_vel=cy-prev_y
prev_y=cy

cz#=EntityZ( car )
z_vel=cz-prev_z
prev_z=cz