The Westcountry is lagging behind most of England when it comes to government spending on transport, official figures show.
The Government spent an average of £315 a head on transport across the UK in 2011-2012. But in the South West, spending was £184 a person.
Spending on rail transport was equally uneven, with the average in the South West at just £40, substantially lower than the national average of £119.
"We are the poor relation," Oliver Colvile, Tory MP for Plymouth Sutton and Devonport, said after meeting the Transport Secretary in London with a delegation from the city.
Alison Seabeck, Labour MP for Plymouth Moor View, added: "You can't have the 15th largest city in the country having the lowest investment in transport."