Clark has been waiting for portable GPS units to become affordable so he can take one on the road when traveling. They’ll probably go below $200 – a consumer item price – next Christmas. But until then, there are other gadgets that may suit your needs. GPS real time traffic devices that warn you of accidents are coming out now. They warn you of accidents up ahead and give you alternate routes. According to USA Today, the “Nav 1” is on markets now. It costs $1,100, plus $60 for the up-to-date traffic information. The pricing is a little screwy, but the idea of taking Web tracking and GPS systems on the road is a great advancement. These will be very affordable when his 6-year-old can drive. By then, people will no longer have to decelerate suddenly because of some accident up ahead. Or maybe we’ll have personal flying vehicles by then.