A--braking system B--breakdowns
C--brick road D--bridge
E--bridge management system F--broken stone surface
G--bus management information system H--bus network
I--bus- kilometer J--bypass road
K--cable car, cableway L--centre line lane
M--changing lane N--climbing lane
O--connecting road P--control station
Q--counter flow R--cross road
S--direct bus T--divided road