Before revision: Choosing a design speed means finding a balance between several interests which compete for priority, such as high vehicle speeds to allow drivers to travel to their destinations quickly versus low vehicle speeds for the safety of people outside the vehicle (such as pedestrians and cyclists), or quick movement of peak traffic (traffic engineering) versus maximising the economic development potential of the street (urban planning).
After revision: Choosing a design speed means finding a balance between several interests which compete for priority, such high vehicle speeds to allow drivers to travel to their destinations quickly versus low vehicle speeds for the safety of people outside the vehicle (such as pedestrians and cyclists), or quick movement of peak traffic (traffic engineering) versus maximising the economic development potential of the street (urban planning).