Caveat emptor: having once worked on an early prototype, I am biased. Also, "Dublin" is restricted to the area covered by Dublin City Council, i.e. the central parts, rather than the outlying parts, such as D15 in Fingal County etc. Still: I find the current version to be a mature piece of code, which provides accurate alerting as to the traffic situation in Dublin, but is not particularly bothersome in asking questions in return.
CrowdAlert at Google Play market analyse