It's a fact of life that many people that cause car accidents will lie to try and escape responsibility for paying for your injuries and damages. It's frustrating because there's nothing you can do to prevent the other driver from lying and you know you did nothing wrong. They lie about who had the green light, who had the right-of-way, or a phantom vehicle that cut them off, etc. We've even heard defendants attempt to claim that they had a sudden medical emergency that caused them to be incapacitated, and thus not negligent. The dashcams is the great equalizer. Nowadays, they make dashcams with two cameras. One facing forward and one facing the rear of the car. The video is admissible into evidence and the jury will be left with no doubt as to who caused the car crash.
At Kinney & Moore, we have handled numerous cases where the other driver did not know we had obtained dashcam video. Under oath, the other driver lied about how the motor vehicle accident happened. And then we showed them the video! As you can imagine, those cases settled very quickly.
If you don't have a dashcam in your car, consider getting one.
If you're in a car accident look to see if the other driver has a dashcam and ask the investigating officer to inspect the video. Also, if there are any witnesses that stopped, ask if they have a dashcam and ask them to email you a copy or while at the scene you can play the video are use your cellphone to video the monitor as it is playing.