ideas for city calming?

that center bar between the tires could help in certain parts of the city....
we have the guard rails on the side
if we just had the rail in the center maybe we would solve some problems

I know that my car would not have been side swipped the other night in baltimore had the road down by the train tracks had this sort of center of the road assistance

maybe some roads could have a retracting center barrier
to protect the parked cars on the way home from the bars
there are certain parking spaces that are known all over
everyone in every town knows a similar such corner
so... if we could install some retracting center barriers that fit between the wheels or all the cars driving through
so that drunk drivers can keep it straight when things get sloppy