Two new bus lines serving the San Fernando Valley are part of service improvements starting this month from the Los Angeles County Metropolitan Transportation Authority. Line 290 travels between Foothill and Mt. Gleason and Olive View Medical Center. It replaces the northern segment of Lines 90 and 91. Line 292 operates between Burbank Metrolink Station and the Sylmar Metrolink Station. In addition, other changes to Valley bus service are extending the route of Line 353 to provide local service west of Roscoe Boulevard and Topanga Canyon Boulevard and Fallbrook Avenue and Ventura Boulevard; and an extension of Line 363 to provide local service west of Sherman Way and Topanga Canyon Boulevard to West Hills Medical Center. The service changes begin June 25.