Traffic Signs & Signals — Rhode Island

The marine pollutant symbol is a white triangle containing a fish with an X drawn through the fish. The handbook, in its section on the List of Marine Pollutants, describes the Marine Pollutant marking as a white triangle with a fish and an "X" through the fish. It explains that any bulk packages of a marine pollutant must display this marking, and that the same marking must also appear on the outside of the vehicle. So the symbol you are looking for is the fish inside the white triangle crossed out.

A driver should sign the vehicle inspection report if noted defects are repaired or certified as not needing repair. The handbook ties your signature to defect certification, not to completing a trip or stopping for fuel. It says a written inspection report may be required each day, and the motor carrier must fix any safety-related items listed and certify that repairs were done or were not needed. You sign the report only when defects were noted and that certification exists. The passenger-bus section repeats the same idea for reviewing the previous driver's report. That is why the signing point is after noted defects are repaired or cleared.

You should drive more slowly when you are not sure you have enough space to drive under a bridge or sign. The handbook says that if you doubt you have safe space to pass under an object, you should go slowly. It also says that if you are not sure you can make it, take another route. It notes that low bridges and underpasses often have warning signs, but sometimes they do not. That makes doubt a reason to be cautious, not to try the clearance at higher speed.