No, there isn’t. There is effectively only one lane each way on King Street. The former curb lane is used for transit stops, bike share stations, art installations, semi-permanent patios and taxi stands. There’s a right turn lane at every intersection but it’s not intended for passing because the lane ends on the other side. Unless streetcar drivers stop at an intersection to allow a bus to pass it on the right, which would be a tight squeeze for buses, then these buses will be driving in gaps between streetcars.