I had better write to the noble Lord on our reasons for increasing the speed limit. The noble Lord asked why the Government are proceeding with the change on single carriageways when most of the consultation responses supported no change. We carefully considered the evidence provided during the consultation. We took into account the high number of hauliers represented by responding trade associations, whose membership ranges from 300 to 14,000 members. Arguably the majority of respondents were in favour of an increase in the limit.
We consider the benefits of change, including time savings and a reduction in congestion and frustration, to be worth while and are confident that rural roads and lorry fleets will continue to become safer and that any road safety concerns can be addressed.
The noble Lord asked about the delayed announcement. We were unsure whether we had fully addressed all possible impacts, so we took the time to do a thorough impact assessment and a review of the impact assessment. The noble Lord asked whether the Government have not assessed the costs and benefits of the change on dual carriageways because we do not
predict a change. We carried out a sensitivity test of the impact of a very small change in speed. It is set out in the impact assessment. It resulted in a benefit to business of £8.9 million per year. The safely impact was an additional 0.18 fatal accidents per year.
On local authorities’ ability to change limits, yes, the advantage of this measure is that if, in certain areas, a local authority feels that the speed limit is too high, it is empowered to change the speed limit to as low as 20 miles per hour.