Anecdotally, where I live has been doing something similar, and it really depends on the specific road as to whether or not it's effective. One of the roads nea

Anecdotally, where I live has been doing something similar, and it really depends on the specific road as to whether or not it's effective. One of the roads near me had this 'road diet' done to it, and the net result was that drivers actually ended up speeding more often on that road because they ended up driving faster to avoid driving next to cars in the narrowed lanes. Since the road diet occurred, I've basically not seen any cyclists using that road anymore because the car traffic has gotten more dangerous.