A.i一般較行車道橫坡大1~2% B.i一般較行車道橫坡大3~4% C.i一般較行車道橫坡大2.5~3% D.i一般較行車道橫坡大2.5~3.5%
A.R+L=A B.R-L=A C.R·L=A2 D.R2/L=A