The first section of roadway on the north tower of the new bridge across the Firth of Forth has been put in place, marking another milestone in its construction.

The roadway is laid over the framework to form the main surface of the Queensferry Crossing which is due to open next year.

The structure forms the centrepiece of a major upgrade to the key cross-Forth commuter corridor in the east of Scotland.

The 1.7-mile (2.7km) bridge will be the longest three-tower bridge of its kind in the world and also the largest to feature cables which cross mid-span.

When the new crossing opens the Forth Road Bridge will become dedicated to public transport use, cycling and walking.

Transport Scotland said the new crossing is being delivered under budget, at around £1.35 billion to £1.4 billion.

In total, the overall project includes major motorway upgrades to either side the bridge and also the first use in Scotland of variable mandatory speed limits to smooth traffic congestion using an "Intelligent Transport System".