The SODO busway opened for bus traffic on December 8 , 1991 .
The SODO busway was initially used by 350 daily trips by King County Metro routes , serving 10,000 passengers and 43 daily trips by Pierce Transit express routes , serving 1,500 passengers .
The SODO busway opened for bus traffic on December 8 , 1991 and was initially used by 350 daily trips by King County Metro routes , serving 10,000 passengers and 43 daily trips by Pierce Transit express routes , serving 1,500 passengers .