Two billion pounds' worth of new road schemes for the region are due to be announced on Monday, ITV News West Country understands.
These are likely to include a tunnel at Stonehenge and making the A358 into dual carriageway - something Yeovil MP David Laws has been campaigning for.
"It's totally unacceptable that we've got a road that is so congested for large parts of the year. That's very inconvenient for people in my constituency who travel around parts of Somerset, it's certainly very inconvenient for people who want to travel across the region. It's absurd that when we're investing so much in other parts of the country that the South West has had to wait for so long."