Thurrock Council is appealing for help identifying a truck that spilt concrete onto the A13.
The driver failed to stop after concrete fell from a yellow and grey tipper truck onto the inside lane of the Southend-bound carriageway on the approach to the exit for the Orsett Cock roundabout at about 3:10pm on Thursday 11 July.
The council's highways contractor attended and briefly closed the slip road to remove debris from the road.
CCTV footage of the incident has been obtained but the council is keen to hear from drivers who have any dash cam footage of the incident, which would enable the registration of the vehicle to be identified.
The vehicle was not connected to the ongoing A13 road widening project.
Cllr Ben Maney, Cabinet member for highways and transport, said: "I would like to thank our highways contractor for going above and beyond by attending this incident and swiftly clearing the road, despite that being outside of its usual remit.
"We take road safety extremely seriously and drivers have a responsibility to ensure their loads are secure.
"I would appeal to anyone who was travelling in the area and has dash cam footage to get in touch so we can identify the driver and take the appropriate action. Anyone with information or footage should email email@example.com".