Fourteen Free Church ministers in the Highlands have written to Transport Minister Keith Brown, urging him to convert the A9 between Perth and Inverness "as a matter of utmost urgency".
The Scottish Government has already pledged to upgrade the A9 - which is the main road tot he Highlands - to dual carriageway by 2025, with a £3 billion project to convert 80 miles of the road.
But accidents on the road have led to calls for that work to be carried out more quickly.
In their letter to Mr Brown the Free Church ministers said they had seen "families being torn apart after loved ones have died in utterly devastating circumstances" and that they had "no wish to conduct any more funerals caused by the tragic and sudden loss of life from accidents on the A9".
A Scottish Government spokesman confirmed that the letter had been received and said it would "respond directly".