Ministers have urged the public to have their say on Scotland's most expensive road project.
The development of the A9, which runs from central Scotland to the north coast, from a single to a dual carriageway route is expected to cost £3 billion, more than the M74 completion, the new Forth road bridge and the Aberdeen bypass combined.
Plans for the first stage of the development, between Kincraig and Dalraddy, are expected to be unveiled later this month.
"The A9 dualling programme is the most expensive transport project in Scotland's history. One that will exceed the cost of the M74 completion, Queensferry Crossing and AWPR combined," Scottish transport minister Keith Brown said.
"This is an ambitious and challenging programme, and we are doing everything possible to deliver improvements and bring forward work where we can.
"The Kincraig to Dalraddy section is the first section of the programme to be dualled and we expect to see work starting there in 2015/16."
Copyright Press Association 2013