Metro Transit route 3 is nearly identical to route 4, except for its terminal points on either end of the route. In fact, Metro's timetables list routes 3 and 4 together. Route 3 is a very popular route, always busy, and uses electric trolley buses most of the time.
Route 3 follows Boston Street and Taylor Avenue N, on the east side of Queen Anne Hill. It stops at Seattle Center on 5th Avenue N.
Route 3 then turns onto 21st Avenue, E Cherry Street, 34th Avenue, and then terminates at 34th Avenue and E Union Street, before starting the route again.