The design of “psychological” traffic calming is based on drivers adjusting their speed to what they feel is right: usually to what they feel is safe for themselves.
Rather than relying on road humps and chicanes made up of additional kerbs and traffic signs, it is achieved by changing the nature of the road through landscape work that enhances the unique quality of the place.
In a rural village for example, the location of the landscaped traffic calming would be appropriate for it’s traffic function and also relate to how people walk and cycle about the village to and from the local church, shops, pub, village hall and car parks, etc. as well as fitting seamlessly into the physical, historic make-up of the village. Detailed designs of the work would reflect local materials and workmanship methods.
In many cases much of the work can be organized and carried out within the community with the highway authority taking the role of enabler. Thus the community is totally involved and costs are contained.
Monitoring the outcomes of all aspect of a project over time allows adjustments to be considered and experience gained to be used in future projects.
References: ‘Psychological’ traffic calming, TRL 641, 2005 for Department for Transport