Jelly, 27 bytes
ṣ”=V€ḟ0
Œr”=e$ÐfṪ€ż⁸Ǥ÷/€S>
Note: assumes that the regex given in the question should be such that a speed limit cannot be 0.0, 0.00, etc. - just like it cannot be 0
Jonathan Allan
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