The American Society of Landscapes Architects ASLA published some guidelines in Universal Design applied to urbanism, with the purpose of spreading the building requirements to make cities accesible, in special to make this information available to those countries where accessibility is poorly legislated.
These guidelines keep in mind the necessities of all population, including the sensorial ones. The guidelines are available on a website, so it is easier to acess them. The environments to which these guidelines refer to are: Neighborhoods, streets, parks and plazas, playgrounds and gardens.
In this website you can find the definitions of the most important elements that have to be kept in mind when designing and building these spaces. Aditionally, the information is complimented with researches developed in this field and with examples based in real cases where good practices of accessibility implementation are shown.
Take a look at ASLA´s Guide to Universal Design