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Definition: Trosedd o dan adran 42 o Ddeddf Traffig Ffyrdd 1988 sy'n ymwneud â thorri, neu fethiant i gydymffurfio â, yr hyn o reoliad 98 o Reoliadau Cerbydau Ffyrdd (Adeiladwaith a Defnydd) 1986 (stopio injan pan fo cerbyd yn llonydd) ag sy'n ymwneud ag atal allyriadau egsôst.
