or make some copy of that plane, then resize those, and these will looking like spot lamps, then the reflection on the floor don't will be a problem because they will looking like in real life - (i hate the future grammar of english...)
i think the rim what taavi used for the scene is made by him
anyway here( http://www.lfsforum.net/showthread.php?t=20429 ) you can find what you wanted, but next time use the search system
it's a bit tricky then that because when he uncheck that the reflection will gone from the car too, but i think, there is way you can do it, i hope can find it
edit: hm i don't think it's possible to linking the reflections, don't know why because it can be realy usefull sometimes, i'll ask some rendering gurus soon