I was driving from Bay Area to a nearby city at night. Lighting was similar. Was driving at about 70-75mph. Saw a flash in the far distance. Had no idea a crash

I was driving from Bay Area to a nearby city at night. Lighting was similar. Was driving at about 70-75mph. Saw a flash in the far distance. Had no idea a crash had happened. Out of extreme caution slowed down to 60mph. In about a minute had a truck right in my lane just like this video. Swerved to another lane to avoid crash. The only reason we survived was that we had slowed down based on a random flash. Another thing I don’t understand is why wont Tesla invest in a front only radar sensor to avoid such collisions.