"Drivers on cell phones, even on hands-free devices, travel more slowly than other drivers, are less likely to pass sluggish vehicles and ultimately take longer to complete their commute — researchers estimate that such distracted drivers lengthen the average car commute by about 5% to 10%."
Look on the bright side - slowing down to 55 mph would save plenty of fuel...
Ofcom in UK is hoping for similar fuel efficiencies as it approves mobile calls on planes in European airspace -)
