The council wants the A40 to be widened to two carriageways
The leader of Pembrokeshire Council has voiced his concern that the Welsh Assembly Government has no plans to widen the main road into the county.
First Minister Rhodri Morgan said the A40 was not busy enough to justify creating a dual carriageway between St Clears and Haverfordwest.
John Davies said that "short-sighted" view ignored the needs of the county.
The assembly government said there was no commitment to widen the road, but did not rule it out in future.
The council has long called for the road to be widened, which would effectively extend the M4 motorway link to Haverfordwest.
Studies carried out by the assembly government three years ago put the cost of carrying out the work at about £155m.
In an interview with the Haverfordwest-based Western Telegraph, Mr Morgan said the level of traffic did not warrant it.
The paper's website quoted him as saying: "Neither the A40 or the A477 justify duel carriageway treatment."
But he said work would continue to try and tackle congestion hotspots at Llandewi Valfrey and Robeston Wathen.
'Disappointed and surprised'
The A40 carries traffic to the ferry port of Fishguard, while the A477 runs to the port at Pembroke Dock.
Mr Morgan told the newspaper: "They would warrant dualling if they were one merged route but they are not, and they never will be."
An assembly government spokesman confirmed there were no plans at present for the work but said it was possible in the future.
But council leader Mr Davies told the BBC Wales news website: "The people of Pembrokeshire will be disappointed and surprised by the short-sighted view expressed by the first minister.
"The county council has proved that traffic growth on these routes in Pembrokeshire is far in excess of traffic growth figures across Great Britain.
"The county's recent economic growth must be sustained, and this will only happen if the assembly government takes a more realistic view of the future needs of this county.
"For the sake of our children, this county cannot be allowed to go back to the situation we were in 10 years ago - and that is where we shall be if the Welsh assembly does not wake up to our real needs."