(Portland, OR) -- Bus drivers are beginning training to use the shoulders of I-205. The emergency lane has been marked and signs are in place alerting drivers. The South Metro Area Regional Transit, or SMART, buses will use the bus lane when traffic slows to 35 miles an hour. The special lanes run between Stafford Road and Sunnybrook Boulevard. Other bus lanes already in use include I-205 over the Glenn Jackson Bridge and on I-5 between I-205 and Elligsen Road.