Austin City Council members on Thursday will consider an ordinance that would require most of the city’s fire vehicles to be staffed with a minimum of four people, a move decades in the making that supporters say will improve safety and efficiency at the Fire Department. The ordinance would essentially bring into law a policy that the Fire Department has already been implementing to make sure that first responders are able to act immediately during a critical fire incident. The city began working toward four-person crews in the early 1990s. Austin fire union President Bob Nicks said council members passed an aspirational resolution roughly 10 years ago that called for making four-person staffing the standard by 2019. With the help of a grant in 2012, the department reached the goal earlier than expected.