MADISON, Wis. -- A campaign to slow drivers down to 55 miles an hour is gaining momentum.

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The goal of the campaign isn't to change speed limit laws but rather to educate drivers about how they can save energy and money by slowing down.

Tim Castleman is the driving force behind Drive 55.org.

He said that he believes that if everyone traveled 55 mph, energy use could be cut by at least 20 percent and maybe up to 50 percent.

"This is something every single one of us can do without sacrificing anything," said Castleman. "Just lighten up, turn the lead in your right foot into gold in your pocket."

Castleman would like to see the law changed back to a slower speed limit.

"We're not really eager to embrace mandates, but it has turned out that it's not possible to drive 55 on the roadways because so many people are speeding around at 80 or 85 mph," said Castleman.

Jim Baxter with the Waunakee-based National Motorists Association said drivers already have the option of going slower.

"If you want to drive slower, drive in the right hand lane, the faster traffic can go by on the left hand side," said Baxter.

Castleman accepts that not everyone agrees with a 55 mph speed limit, but said he doesn't see a better alternative.

"We really have to educate people about how much of an impact this can make," said Castleman. "It's not just a little bit like some detractors like to say, this is significant. A major amount of energy could be saved."