Traffic ground to a halt in Footscray this morning as another container truck smashed into the notorious Napier Street bridge underpass.

Peak-hour traffic came to a standstill after all eastbound lanes were closed when the container smashed into a barrier, crumpling as it toppled onto the adjacent footpath.

The 4.0m bridge has now been hit almost 70 times since 2005.

The barriers were realigned earlier this year to improve safety at a cost of $600,000.

The state government announced in May it will spend a further $1.1 million on a safety upgrade that will include alarms that notify authorities and automatic number plate technology to capture the details of drivers disobeying the 4-metre height limit.