00:00. WASHINGTON, Dec 6 (Reuters) - An emergency spending bill to provide billions of dollars in new security assistance for Ukraine and Israel was blocked in the U.S. Senate on Wednesday as How Does Hill Start Assist Work? Whenever you stop on a slope or hill, sensors in your vehicle send a signal to trigger the hill start assist system. For a short while, this feature will hold your brakes for you until you can start your car again. .

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