Consumer Reports said Thursday that Tesla Motors is misleading car owners by calling its semi-autonomous driving system "Autopilot," potentially giving them too much trust in their car's ability to drive itself.

The influential magazine said Tesla should drop the Autopilot name and disconnect the automatic steering system until it's updated to make sure a driver's hands stay on the wheel at all times. The system currently warns drivers after a few minutes of their hands being off the wheel.

In an email, a Tesla spokeswoman said the company has no plans to change the name, and that data it collects show drivers who use Autopilot are safer than those who don't.

With its statement, Consumer Reports joined a debate over autonomous driving technology that escalated after authorities revealed that Joshua Brown, 40, of Canton, Ohio, died in a May crash in Florida with the Autopilot on in his 2015 Model S. The system didn't detect a tractor-trailer that had turned in front of the car in bright sunshine, and Brown also failed to react.

The National Highway Traffic Safety Administration is investigating the wreck and the functioning of the Autopilot system. After the crash, critics accused Tesla of giving drivers access to a system that wasn't ready, while supporters contended the company was improving automotive safety.

Tesla's Autopilot system uses cameras, radar and computers to detect objects and automatically brake if the car is about to hit something. It also can steer the car to keep it centered in its lane. The company says that before Autopilot can be used, drivers must acknowledge that it's an "assist feature" that requires both hands on the wheel at all times. Drivers also must be prepared to take over at any time, Tesla has said.

Yet Laura MacCleery, Consumer Reports' vice-president of consumer policy, said naming the system Autopilot gives drivers a false sense of security. Autopilot, she wrote, can't actually drive the car, but it lets consumers keep their hands off the steering wheel for minutes at a time.

"We're deeply concerned that consumers are being sold a pile of promises about unproven technology," she said in a statement.

Last week Tesla disclosed that a Model X SUV crashed recently in Montana while the driver was using the autosteer feature on a two-lane road, which is not recommended by the company. Tesla, which gets information from its cars over the internet, said the car warned the driver at least once to place his hands on the steering wheel before it crashed.

MacCleery called on the Palo Alto, California, company to disable automatic steering until it updates the computer program to ensure a driver's hands are on the wheel.

Consumer Reports also said Tesla should issue clearer guidance on how Autopilot is used and what its limitations are. Tesla CEO Elon Musk has said in a blog posting he'll provide more thorough guidance and the spokeswoman said that was coming.

Tesla released Autopilot last fall and says the system is still in a "public beta," or testing phase. Critics have complained that Tesla is using drivers as "guinea pigs" - a sentiment echoed by Consumer Reports.

Tesla said Autopilot underwent millions of miles of internal testing and is updated constantly. "We will continue to develop, validate, and release those enhancements as the technology grows," the company's spokeswoman said.

(China Daily 07/18/2016 page19)