unusual bumps in track surface!

bulletman04

hi, i have created this track in 3ds max 2010 and as i have progressed adding textures/material to the track surface i have noticed this un-even 'wavy' track surface on undulated parts of the circuit!
Could anyone shed any light on why this maybe, or even better a solution to fixing this (as i have already converted it to an editable poly) would be very very helpful.

thanks

(image attached)

View attachment 11720
 

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