Comment by reefab

My answer to some of those issues have been to use a folding bike and combining transport modes.

A 15km ride might be 13km of RER and 2km of biking, on some trips it's pretty damn fast even compared with a car that has to contend with traffic.

It doesn't solve the rain issue on the other hand. Especially as folding bikes generally have smaller wheels that tend to skid on wet pavement.