Road signs and barriers could be brought in to protect motorists from wild boar after a Wiltshire man was killed on the M4 last Monday.
Roads minister John Hayes says the death of Raymond Green had raised the stakes.
Now ministers are considering what action to take to avoid further tragedies, which could include the transport department entering private estates to cull animals considered a danger.
The death of the 47-year-old from Royal Wootton Bassett, who hit a wild boar on the eastbound carriageway near Junction 17 for Chippenham, has prompted the review.
According to The Sunday Times, ministers are keen to follow Germany and France with signs warning motorists about the feral pigs that can grow up to 20 stone.
The proposed new triangular sign for use in "infested areas" would show a boar and be similar to those currently used for deer, horses and even ducks.
"Road safety in the context of wild boars is an emerging issue that needs to be addressed," said Mr Hayes.
"The addition of a warning sign for wild boar in areas with populations of the animals would be a sensible step to encourage people to slow down and watch out."
The Forest of Dean and Kent are the main hotspots for the boar in the UK but they are also roaming the countryside in 20 other areas, including Dorset and Wiltshire.
In the Forest of Dean, the boar have divided the community, with many people calling for tougher culls than at present because of the nuisance value and danger to motorists from the boar after the number of accidents grew.
But Defra says it is down to individual landowners and the Forestry Commission faces opposition from animal rights protesters whenever it carries out a cull to keep the population under control.
