Or. Admin. R. 734-020-0125
On defined sections of state highways the Chief Engineer shall install signs for each direction of traffic using the legend “ONE-WAY TRAFFIC FOR TRUCKS AND BUSES AHEAD” and “ONE-WAY TRAFFIC FOR TRUCKS AND BUSES” at the beginning of the defined section.
ORS 184 & 366
ORS 810.030
2HD 6-1981, f. & ef. 10-2-81