Pretty sure E911 piggybacks on the periodic pings that happen to towers. You cell phone needs to periodically hit the tower to determine CDMA power for the code division to work correctly. Either way positional(and extrapolated from that, speed) data is available to carriers.
Fair point on who's holding the phone but I think there are certain cases where it can be determined. I'll full agree that any solution isn't perfect, however the stakes of someone driving distracted are high enough that I think it's at least worth trying to tackle it.
Fair point on who's holding the phone but I think there are certain cases where it can be determined. I'll full agree that any solution isn't perfect, however the stakes of someone driving distracted are high enough that I think it's at least worth trying to tackle it.