However , this is currently economically and spatially unrealistic on most all streets .
Ultimately , separating modes of travel that require different speeds ( walking , cycling , motor vehicles ) is ideal in the prevention of crashes and injuries between these modes .
This is currently economically and spatially unrealistic on most all streets .
Ultimately , separating modes of travel that require different speeds ( walking , cycling , motor vehicles ) is ideal in the prevention of crashes and injuries between these modes .