I was driving southbound on Highway 6 in west Houston, looking for a restaurant that I had never been to. While looking to the sides of the road for the building and it's address, a car slowed to a stop in front of me that I did not see, and I nearly rear-ended him. In fact, I'm nearly positive I would have rear-ended him without the Tesla's Forward Collision Warning alert, which alerted me to brake. Note that this was NOT Automatic Emergency Braking (a feature that will brake and slow the car for you to mitigate a rear-end collision). I performed the braking maneuver myself, the car did not. My reaction time from the first loud beep of the Forward Collision Warning alert to stepping on the brake was 0.766 seconds. My dashcam recorded a maximum deceleration G-force during the braking maneuver of 0.9 G. Note that my dashcam time is off, it's on GMT, I'm in US Central. Actual time of day is 19:31. This is the G-Force graph from the dashcam. The Forward-Back (FB) line in purple shows the braking maneuver. I deleted my colorful language in the video, but I think you can deduce what was uttered.