Dunblane 20MPH

This is a survey by Dunblane and Bridge of Allan Councillor Alastair Majury to help establish whether or not the community supports the proposal by Stirling Council to introduce widespread 20MPH limits. 

A 20mph Zone: These are designed to be "self-enforcing" due to traffic calming measures which are introduced along with the change in the speed limit. Speed humps, chicanes, road narrowing, planting and other measures are typically used to both physically and visually reinforce the shared nature of the road. This requires investment in these physical measures and is more expensive but more effective.
 
A 20mph Limit: These consist of just a speed limit change indicated by signs. No physical measures are installed to reduce vehicle speeds. These have been proven to be far less effective.

The Guardian has reported that the 20mph limits have shown limited effectiveness, reducing speed by around 1mph.
 
Islington council - Before 20mph limits were introduced, 85% of the traffic on Islington’s main roads was travelling at an average of 28mph. After the limits were introduced, this average decreased by just 1mphto 27mph.  
Bristol and Brighton’s pilots of 20mph limits tell a similar story, with daytime speeds in Bristol dropping by around 1mphto an average of 23mph. In Brighton, the council saw a 1mph decreasea year after 20mph speed limits were introduced in 2013.
 
The UK’s Department for Transport’s published a report in November 2018 by prepared by Atkins, AECOM and Professor Mike Maher of University College London (20mph Research Study) also showed that in residential areas with 20mph limits less than half (only 47%) of drivers complying with the limits and hence a majority of drivers exceeded the 20mph limits.
 
The report also highlights that:
 
The evidence suggests that, within the case study areas, the character of the road has a bigger influence on driver speed, than whether the limit is 30mph or 20mph. The difference in speed between the different road types is far larger than the change bought about by the change in speed limit. It appears that some roads lend themselves to good 20mph compliance more than others, probably due to the characteristics of the roads themselves. In other words, some roads are naturally ‘self-explaining roads’ where drivers ‘instinctively’ drive more slowly, while in other cases the look and feel of the road environment naturally encourages higher speeds. Changing the look and feel of a street (e.g. through road markings, landscaping, and roadside activity – see Kennedy et al. 2005) may therefore result in higher levels of compliance.