China should amend its law on road traffic safety, as the illegal production and modification of vehicles and electric bikes poses mounting threats to road safety, according to a report released by the top legislature on Wednesday.

The report on the implementation of an amended road traffic safety law, conducted by the Standing Committee of the National People's Congress, said that a sharp increase in the number of vehicles and drivers poses major challenges to traffic management and a revision of the law is necessary to enable the authorities to cope with the issue.

"There is a need to step up punishments for those violating the law, especially in terms of overloading of trucks, and the illegal production and sales of vehicles," the report said.