Rotaries allow access to any road from any road generally without the use of traffic control lights.
Experts predict that using such vehicles can help improve road safety and allow busy road networks to cope with greater numbers of vehicles.
The Viggen usually goes where it's pointed, and the power assist is nicely tempered to allow adequate road feel.
The Environment Department said the repair work would allow the road to reopen within a week.
Mr Jones called for "consistent funding over a number of years" to pay for resurfacing projects to allow the road network to recover.
When the Glynneath bypass was built in the 1970s, the canal was culverted above Ysgwrfa lock, to allow the road to be straightened, and reduced in width beyond that, to allow the road to be widened.
Two sets of gates on either side of Independence Pass allow the road to be closed in winter.
The third rail required all level crossings to be removed, resulting in the line being rebuilt several places to allow the road to underpass or overpass.
Mark spaces equally on them that will allow the road of the bridge to fit comfortably between the walls of the truss.
A smaller road was built to the north of the runway to allow road transport while the runway was in use.
