Young people in Scotland are able to get cheaper travel on buses, trains and ferries under a new scheme.
The scheme was launched last year at Edinburgh's Waverley Station
The Scottish Executive's Concessionary Travel Scheme means 16 to 18-year-olds are entitled to a third off bus and rail fares.
Young people on Scottish islands will also get two free return journeys to the mainland each year.
However, the Greens and the SNP have branded it a "let down" as it does not extend to full-time students.
The executive said the scheme would open up opportunities to access work, education and social events.
Full-time volunteers up to the age of 25 who are actively contributing to their community are also included in the scheme.
However, Ruth Cameron, Scottish Young Greens convener, said: "This scheme is frankly inadequate.
"By abandoning their commitment to discounted travel, the executive has let down thousands of full-time students."