NEWPORT BEACH

The Firefighters Assn. has joined police union members in opposing Measure S, making the group the second organization of city employees to come out against the slow-growth measure on the November ballot.

Union officials said the measure, also known as the Greenlight Initiative, would jeopardize funding for road improvements needed to ensure a quick response to a fire. The union has 94 members.

Measure S proposes to put major new developments to a citywide vote.

Supporters say the initiative could raise more money for traffic improvements than the traffic-phasing ordinance now in place. Under that law, developers have to pay only their “fair share” of the traffic increase their projects create.

The Newport Harbor Area Chamber of Commerce has endorsed Measure T, also known as the Traffic Phasing Initiative, which would add parts of the city’s traffic-phasing ordinance to the city charter and nullify Greenlight, should voters approve both measures in November.

Stop Polluting Our Newport, an environmental activist group, is the only organization that has come out in support of Measure S so far.