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Welcome to Tech News Briefing. It's Tuesday June 11th. I'm Zoe Thomas for the Wall Street Journal.

Smart traffic signals can help improve congestion, but most cities can't afford them.

Fortunately, data from new cars and even drivers' smartphones can make old-fashioned

traffic lights work a lot better.

Our tech columnist Christopher Mims will tell us how this cheap fix works and where it's being tried out.

And then, Apple will offer users personalized versions of generative artificial intelligence features.

At the company's worldwide developers conference, the iPhone maker showed off its

new system-wide software update called Apple Intelligence and touted a new AI partnership.

Our personal tech news editor Shara Tippkin will join us with the details. We're stopping at traffic signals first. Do you ever wonder how much of your life

you spend waiting at red lights? According to one study, Americans spend an average of 10% of their travel time during short trips stopped at red lights.

Well, new products could create green waves across cities without forcing local governments to install costly new equipment.

Here to tell us more about this is our tech columnist Christopher Mims.

Christopher, Google is expanding a one-year-old product called Green Light, and there are research projects

elsewhere working on this. The key here is that cities or municipalities don't have to pay for

new tech to measure congestion.

So tell us where do these systems get the information to know when lights should be

changed from red to green?

Companies like Google and automakers have tons of data on where we are at all times.

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