Starting this year, expired smoke detectors with detachable batteries must be replaced with more modern hard-wired devices.

The new year brings a panoply of fresh rules into effect for Chicago residents and businesses, including a litany of measures designed to help the city’s most vulnerable residents while simultaneously making life easier for entrepreneurs.

The following is a roundup of major city legislation that took effect when the clock struck midnight on Friday night, as well as subsequent city policies set to take place in the months to come.