General Road and Highway Discussion

[jwilliamson]

I suspect that the standards you are asking about can be found in the TAC manual that is used by—I’m guessing all Canadian road building organizations despite it not being AFAIK a regulatory requirement. It’s more an engineering liability requirement—use this book to not get sued. 

https://www.tac-atc.ca/en/publications-a...dian-roads

Transportation Association of Canada - Geometric Design Guide for Canadian Roads. 

Unfortunately it is an expensive book and I don’t have a copy so I don’t know if it contains roundabout specific guidance or if it is just being cobbled together from other parts of the standard.

For those of us who are in Canada, Inter-Library Loan is a wonderful thing. A couple of Ontario universities have it for instance. Public libraries can do ILLs sometimes too.

Looks like Dana Porter has a copy.

https://ocul-wtl.primo.exlibrisgroup.com...9933505162&context=L&vid=01OCUL_WTL:WTL_DEFAULT&lang=en&search_scope=OCULDiscoveryNetwork&adaptor=Local%20Search%20Engine&isFrbr=true&tab=OCULDiscoveryNetwork&query=any,contains,Transportation%20Association%20of%20Canada%20-%20Geometric%20Design%20Guide%20for%20Canadian%20Roads.%20%20