If you're riding a bike on the roads in France you are covered by the Highway Code so need to make sure you are obeying the law. The law in France states that to ride on a public highway you must have;A high-vis vest or jacket if you are riding at night or in poor visibilityA working bell - so you can alert other road users to your presence. It's also worth pointing out that it is illegal to wear headphones while cycling, and also to use your mobile phone. Not compulsory but recommended are reflectors, mirrors and the wearing of light-coloured clothing while cycling, top make you more visible. One more thing that you will need to cycle in Paris is a certain amount of courage.
Source: The Local December 18, 2019 14:15 UTC