2. Dynamic Weather System
Experience Real-Time Weather Changes with Realistic Rain (Good thing cars now have working wipers)

In addition to the time transition feature announced at E3 in June, where you can experience the day to night transition of time during a race, Gran Turismo 5 will also have real-time weather changes on select tracks.

Factors like temperature, pressure and humidity are all calculated to help simulate weather conditions that change dynamically. Rainfall will alter the course scenery and conditions, changing the dynamics of the race. Combined with new visual effects like time transitions and realistic tire smoke simulation, Gran Turismo 5 offers a detailed and immersive racing experience like no other.

Just imagine racing as the early evening sky turns purple. You start to see sprinkles of rain hit your windshield. Rain drops are lit by headlights ahead of you, and mist from the tires of the car in front of you blankets your windshield. You hit the wipers to clear your view of the road and get back to the task at hand: finishing the race and hopefully coming in first.

*Note that not all courses will incorporate these visual effects.
*Note that windshield wipers will only operate on premium model cars.