This publication is aimed at citizens wanting to gain a better understanding of how transportation is planned so that they can contribute to better street and road planning. While this extensive handbook does not focus on universal design per se, it does focus on greater inclusion, activity and participation in public areas. Published by AARP, it is specific to North America in some of its advice, but the handbook should be of interest to anyone interested in transportation and street planning and community engagement. The many photos in the publication show some good examples.
The main website also has many other resources.