Vehicle Activated Signs - VAS

[lino]

Hello,

I am Lino and I am interested in using vdrift for making a simple
educational demo.

I would like to put on one of the vdrift tracks a sort of

"Vehicle Activated Signs - VAS"

http://www.surreycc.gov.uk/SCCWebsite/sc...endocument

that is something that, when the car is near, displays some message
like "slow down" or the current speed of the car.

I am new in vdrift and I am wondering about the correct method to do
this. I think that the best method would be to modify an existing
track to put the VAS and then to add some code to the engine to modify
this sign (maybe putting some texture over it) when the car is near.

Another option would be to draw the entire sign in code, using simple
OpenGL primitives.

The sign hasn't to be very realistic, only a demonstration.

What can be the correct way of doing this?
Or can you suggest me an alternate way?

Thanks a lot,
Lino