By Ben Kesling 
 

Expanding toll-road operations throughout the U.S. and overseas prompted 3M Co. (MMM) to pay $110 million in cash for a unit of Federal Signal Corp. (FSS) that will bolster the company's profile in the tolling industry.

The Minnesota company announced the agreement Thursday to purchase Federal Signal Technologies Group. The sale price was almost double what some analysts had seen the unit going for, as there had been speculation it might be on the auction block. It lifted Federal Signal's share price 19% in recent trading.

3M shares slipped 1% to $86.70 a share. The company said the purchase will dilute earnings by two cents a share in the first year after the purchase.

Federal Signal Technologies Group focuses primarily on parking management, license-plate-recognition software and toll collection.

"3M's expertise and innovation in the traffic industry make it a natural choice to continue to build this important business," said Dan McGurran, director of 3M's motor-vehicle systems and services.

3M manufactures more than 55,000 products in 60 countries. This acquisition will expand its footprint in the world of high-speed tolling, allowing motorists to pay fares via electronic transponders without having to slow down on the highway.

3M said the electronic-tolling industry is a $3 billion sector expected to expand by more than 12% a year "as government agencies increasingly rely on tolling to fund roadway infrastructure, construction and maintenance."

"Federal Signal offers technology that is new to us," said company spokeswoman Donna Fleming Runyon. "But it's complementary to technologies we already use for our traffic-management solutions."

The technology group lost $3 million for Federal Signal in the first quarter of 2012, and analysts had expected Chief Executive Dennis Martin to put this portion of the company on the auction block.

Walter Liptak, an analyst at Barrington Research, said in a note he sees little risk in the deal being approved and 3M's spokeswoman said the company expects to close the deal in the second half of 2012.

When Mr. Martin took the helm at Federal Signal in November 2010, he immediately announced he wanted to pare costs and consolidate operations.

"3M is a company committed to acquisition spending," said Adam Fleck, equity analyst at Morningstar Inc. "They've mentioned they want to spend about $2 billion in acquisitions this year and this is around 5% of that."

Mr. Fleck said the acquisition won't be as much of a synergistic "slam dunk" as 3M's purchase announced in January of the office-and-consumer-products division of Avery Dennison Corp. (AVY), but "it's a nice tuck-in for 3M" and will "bring in technology they can leverage across their entire portfolio."

Write to Ben Kesling at benjamin.kesling@wsj.com

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