Wondergirl
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The other thing is, what if the reason the glass marking beads had been on the road in the past, is because they were of a temporary nature, because they were applied between November and April, as per below?
Thermoplastic shall be applied only when the pavement temperature is 55 ºF (13 ºC) or greater and no later than November 1 or earlier than April 15. If the thermoplastic markings cannot be placed according to these specifications and the road is to be opened to traffic between November 1 and April 15 and no adequate pavement markings are in place, the Contractor shall, at the direction of the Engineer, place temporary pavement markings according to Section 703. The Contractor shall remove the temporary pavement markings and place the thermoplastic pavement markings on or after April 15 or as agreed upon by the Engineer.
http://dot.state.il.us/desenv/spec2007/div700.pdf