I have an idea that will revolutionize navigation in cities and significantly benefit Waze users - predictive traffic light data.

By leveraging real-time GPS data from our massive user base, our app can start predicting traffic light patterns at intersections. Using algorithms to analyze when cars stop and start at lights, we can gradually build models mapping out sequences and wait times for traffic signals across entire cities.

This would enable sending users notifications in advance whether they are likely to hit the next green or red light. They can adjust speed accordingly, eliminating unnecessary braking and idling. The benefits are immense:

Smoother driving - No more anxiety around unpredictable lights.
Optimized routes - We can factor light timings into the fastest routes.
Saved fuel - Less braking means big gas savings over time.
Reduced emissions - Lower carbon footprint via smoother driving.
Decreased congestion - Optimized traffic flow eases congestion.
Improved safety - reducing sudden stops lowers accident rates.
In essence, this becomes an optimization and prediction engine to enhance navigation, leveraging real-time crowdsourced data. The more users we have, the smarter the system gets. We can even work directly with city officials to improve traffic planning using our insights.

The data and technology already exist - this puts them to use for a game-changer feature. Drivers spend 13% of urban commute times waiting at lights - we can give them that time back, and revolutionize how people and vehicles flow in the world's cities.

Let's discuss the viability and impact further. This could redefine navigation and mobility for a greener, smarter future. Are you in?