Parts of a striking architectural bridge that opened on the Peninsula Link freeway in January are at risk of falling off and hitting cars, the construction company that built it has warned.

Total Building Construction has warned the state government's road and building authorities that the large, blue sheet metal panels it installed on one freeway bridge have "the high probability of a collapse".

The blue sheet metal panels have a 'high probability of a collapse'. Credit:Joe Armao

Road authorities and the consortium that runs the road under contract to the state government, though, say the road is safe and that there are no risks of bridge panels falling.

The Peninsula Link Freeway runs from Carrum Downs to Mount Martha. Built by consortium Southern Way over more than two years, it opened in January.