The automated lane-change feature in Autopilot, Tesla's semi-autonomous driver-assistance system, is worse than a human driver, Consumer Reports said in a review of the feature published on Wednesday.

Consumer Reports said its testers found that the feature wouldn't leave enough space in front of approaching cars when changing lanes, would often brake abruptly after merging into dense traffic to create more space behind the vehicle ahead of it, and would sometimes make a maneuver that is illegal in Connecticut, where the publication ran its tests.

Testers often had to cancel lane-changes initiated by Autopilot due to safety concerns, Consumer Reports said.

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Autopilot can control steering, braking, and acceleration in some situations, but requires human supervision.

In April, Tesla updated Autopilot to allow it to make lane changes without the driver's approval, though the driver must activate this feature.

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