NEW YORK — Federal auto safety regulators are investigating why Tesla repeatedly broke rules requiring it to quickly tell them about crashes involving its self-driving technology.

The National Highway Traffic Safety Administration said in a filing Thursday that Tesla's reports on "numerous" incidents involving its driver assistance and self-driving features were submitted several months after the crashes instead of within five days as required. Tesla told the agency the delays were "due to an issue with Tesla's data collection" that was since fixed.

The electric vehicle maker started a self-driving taxi service in Austin, Texas, with hopes of national expansion and wants to send software updates to millions of Teslas to allow them to drive themselves. Investors enthusiastic about such pl

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