§ Mr. Amos
To ask the Secretary of State for Transport what conclusions have been drawn from the research into pluvious road surfaces being carried out at the Transport and Road Research Laboratory with regard to(a) whether spray-reducing benefit can be applied to the resurfacing of existing roads and (b) whether this will be a general specification of new roads as proposed in the White Paper, "Roads for Prosperity"; and if he will make a statement.548W
§ Mr. Peter Bottomley
The Transport and Road Research Laboratory has been undertaking a full-scale trial of pervious macadam road surfaces since 1984 on the A38 Burton bypass.
Trials of new materials normally last for five years so that their performance can be compared with conventional materials before they are permitted for general use.
In this case the material appears to be as durable as conventional materials and is effective in reducing vehicle spray.
We are proposing to amend the Department's specification to allow the use of pervious macadam on new or existing trunk roads. The aim is to issue it early in 1990 as soon as the trials have been completed and the results fully assessed. This will depend on those results being satisfactory.
Pervious macadam could prove more expensive than conventional materials and if so its use is more likely to be justified on sections of road where, for example, increased accident savings can be demonstrated.