Or. Admin. R. 734-077-0040 – Leakage Restrictions

(1) Fluid leakage will be permitted only to an extent and under conditions which will not create a safety or health hazard to the general public. Excessive loss of fluid containing residue which can cloud the windshields of other vehicles, the creation of a build-up of residue causing slippery pavement conditions, or the excessive loss of fluid from parked hauling vehicles causing unsanitary conditions adjacent to restaurants or other businesses, or residences may result in revocation of the permit.
(2) The Chief Engineer may impose additional permit provisions in in addition to those required by this rule, but in accordance with ORS 818.220 as deemed necessary to provide a maximum of highway safety for the driving public.

ORS 184 & 366

ORS 818.230