one method to induce a sensation of travelling at high speed is through the use of so called psychological traffic calming where road features and markings are used to create a heightened awareness of the need to slow down andor of entry into a lower speed zone an example of an entry treatment is the now widely used installation of a gateway at village or town entry as shown in figure one example is the study of jamson et al a major criterion used in the testing was the durability of the effect ie a demonstration that it would work on repeated experience rather than wearing off after the initial encounter