By Mike Spector 

A revamped Cadillac CTS sedan hits U.S. roads next year as the first vehicle on sale with wireless technology for chatting with other cars--a feature experts say will make travel substantially safer.

Unfortunately, the Cadillac will have few other cars to talk to.

After 16 years of having its own band of airwaves set aside as a wireless lane for vehicle-to-vehicle communications, or V2V, the auto industry has yet to use it. Most auto makers are testing connected vehicles, but General Motors Co. is the only auto maker to disclose a firm plan to launch one for U.S. drivers.

Impatient with the progress and desirous of more spectrum for their own needs, cable, telecommunications and other technology companies want auto makers to cough up a portion of these airwaves. To that end, networking firm Cisco Systems Inc. joined car companies earlier this month to brief Federal Communications Commission staff on plans to start working together soon on testing whether the airwaves can successfully be shared.

Last week, U.S. Transportation Secretary Anthony Foxx also said regulators would propose a rule by the end of this year mandating auto makers produce V2V-equipped vehicles at some point--accelerating a previous government timeline. He also committed to regulators completing a "preliminary test plan" of their own on connected vehicles sharing spectrum with other unlicensed users within a year of the auto industry making production-ready devices available for testing.

While opening up these airwaves could help unclog the information superhighway, auto makers say giving unused spectrum to other mobile devices is a risky move, potentially interfering with airwaves needed for vehicles and infrastructure to send collision warnings once V2V is more widely deployed.

"Latency kills," said John Bozzella, a former Chrysler executive who is now chief executive at the Association of Global Automakers, a Washington advocacy group representing Toyota Motor Corp., Honda Motor Co. and other car makers. "There can't be any amount of time between your vehicle and mine. There can't be any buffering."

The auto industry has placed a big bet on the promise of V2V. Using signals similar to Wi-Fi, the technology is designed to reduce the likelihood of human error by alerting the car to an array of traffic conditions, among them icy roads, stalled vehicles, lane closures, crashes up ahead and when another vehicle is entering an intersection. Vehicles could also communicate with traffic lights and road sensors to cut down on traffic jams, fuel use and greenhouse gas emissions.

Getting the sprawling U.S. car fleet to the point where Mr. Bozzella's warnings can be tested could take several more years. There are 250 million vehicles on U.S. roads, most with no capability to interact with other cars or infrastructure.

Federal regulators are working on rules to take V2V from the lab to the road, but also fielding pressure from corporations such as Comcast Corp. that want some of the wireless space reserved for auto makers since 1999.

Some lawmakers, responding to clogged wireless networks and explosive demand for faster Wi-Fi coverage, are eager to tackle the problem.

Republican presidential hopeful Sen. Marco Rubio of Florida is among lawmakers introducing legislation to require the FCC to study sharing an upper portion of the auto industry's 5.9-gigahertz band. Proposed with Cory Booker (D., N.J.), the bill would require the FCC to consult with the Transportation Department, among others, on whether Wi-Fi users can have spectrum without compromising V2V's effectiveness. Similar legislation has been introduced in the House.

Earlier this year, two FCC commissioners said sharing of the spectrum among auto makers and other companies should be explored. The FCC has allowed Wi-Fi users before to share other previously reserved pockets of spectrum, including an action in April to open airwaves used by military radars.

Rick Chessen, senior vice president of law and regulatory policy at the National Cable & Telecommunications Association, representing Comcast and other big companies, said other devices can mingle on the auto industry's airwaves.

He noted auto makers haven't produced viable connected vehicles to sell. "Rather than engage in a solution that benefits everyone, the car industry continues to stonewall and use scare tactics."

The National Highway Traffic Safety Administration is lining up behind the auto makers' desire to keep the V2V lane uncorrupted. The Transportation Department estimates connected vehicles could address 4.5 million crashes annually, or about 80% of accidents involving unimpaired drivers.

"It's about making sure no intrusion into that spectrum is going to cost a life," said Mark Rosekind, the NHTSA's chief. "The burden really should be on: Show us the data that sharing is not going to be a risk to safety."

Taxpayers and auto makers have spent nearly $1 billion combined researching and readying a connected-vehicles rollout, but much of the action is relegated to testing. The University of Michigan, joining with local government, is preparing to deploy 20,000 connected vehicles in the Detroit area as soon as 2017.

Write to Mike Spector at mike.spector@wsj.com

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