Motorway Madness!

Billions of euro have been spent on a motorway network in the recent past. I submit that this money would have been better spent on high grade dual carriageways rather than motorways.
Dual carriageways would have been cheaper and more quickly built. There could have been a larger network throughout the country.
The money saved could have been put into upgrading secondary routes and high traffic volume local and regional roads.
There is also the added advantage that the speed limits for dual carriageways is lower (100 kph as opposed to 120 kph on motorways) and therefore are more fuel efficient!