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According to French traffic law, a high visibility vest MUST be worn when riding at night (safety standard number EN 1150 or EN 471).
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I'm pretty sure the Proviz stuff is all EN471, their website seems to agree.
The PBP entry fee includes a vest that meets the standards too. Useful if you've just got the Proviz jacket as I wouldn't like to be forced to wear a jacket all night (to comply with the law) if it's too warm.
http://www.paris-brest-paris.org/index2.php?lang=en&cat=randonnee&page=reglement
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According to French traffic law, a high visibility vest MUST be worn when riding at night (safety standard number EN 1150 or EN 471).
"
I'm pretty sure the Proviz stuff is all EN471, their website seems to agree.
The PBP entry fee includes a vest that meets the standards too. Useful if you've just got the Proviz jacket as I wouldn't like to be forced to wear a jacket all night (to comply with the law) if it's too warm.