Aegis Mobility, a Canadian software company, announced Monday that it has developed software called DriveAssistT that will detect whether a cell phone is moving at car speeds. When that happens, the software will alert the cellular network, telling it to hold calls and text messages until the drive is over. The software doesn't completely block incoming calls. Callers will hear a message saying the person they're calling appears to be driving. They can hit a button to leave an emergency voice mail, which is put through immediately. Several states, including New York and California, have introduced laws against talking on a cell phone while driving, but they still allow the use of hands-free devices like Bluetooth headsets. However, studies have shown that hands-free devices may not help. It appears that it is the distraction of dialing or talking that is dangerous, rather than the act of taking a hand off the wheel.