A Pavement Sealant Ordinance on the agenda for the June 6, 2016 Ann Arbor City Council would prohibit use of coal tar based sealants on pavement.
More info at http://hrwc.org/coaltar from the Huron River Watershed Council.
Timeline: Pavement Sealant Ordinance
March 7, 2016. Watershed group wants ban on coal tar sealants. Observer and Eccentric Newspapers "Hometown Life"
December 17, 2014. Issues of The Environment: The Dangers Of Coal Tar Sealants. David Fair, WEMU.