The bus and coaches category registered the highest decrease in traffic volume, down by 50% compared to 2019 followed by motorcycles, Chart 1.
Y categori Bysiau a Choetsys a gofrestrodd y gostyngiad mwyaf o ran lefelau traffig, i lawr 50% o'u cymharu â 2019 ac yna Beiciau Modur, Siart 1.