This date is approximated from two coins found in the centre of Letocetum beneath the first road surfacing.
Applying gravel, or "metalling," has had two distinct usages in road surfacing.
"Road metal" later became the name of stone chippings mixed with tar to form the road surfacing material tarmac.
The two pits had stone crushing plant and coating machinery for making Tarmacadam for road surfacing.
Mixing ground-up tires with asphalt for road surfacing often does not meet official specifications.
Typical areas of use would be for driveways, pavement, patios, town centres, precincts and more commonly in road surfacing.
Glauconite gravel is used for road surfacing.
Beginning in the 1950s, aggregate was extracted from the river bed for road surfacing and wear-resistant concrete.
Gnanakan pioneered the use of waste plastics for road surfacing in India.
There are a number of small disused quarries and pits, mostly now overgrown, which were used to provide gravel for road surfacing in Victorian times.
