LANSING, Mich. -

An attempt to raise taxes to improve Michigan's roads and bridges has stalled in the Republican-led state Senate.

Senators late Wednesday night fell short of the votes needed to move forward with legislation to more than double the 19-cents-a-gallon gasoline tax within five years. They also couldn't muster enough support to switch from a flat per-gallon tax to one that would fluctuate with price changes to at least keep revenue in pace with inflationary construction costs.

Advocates say Michigan needs to spend at least $1.2 billion more a year on its deteriorating roads.

Earlier, senators soundly defeated a proposal that would have let voters raise the 6 percent sales tax to 7 percent if they didn't like the gas tax hike.

Senators are still meeting in Lansing and could vote again on the gas tax.