Every other nation has cell phones so I fail to see how the cell phone argument holds water.
Also the safety of speed for a given environment should include pedestrians. Many advocates for urban areas rightfully push for 25 mph limits for exactly that reason. If you want to successfully convert in town urban roads that are wide and have high speeds to 25mph there are two good options: speed calming measures or speed cameras.
I live in NZ and they introduced laws here where you can be fined and potentially lose your license for using your phone while driving citing it as being dangerous.
Also the safety of speed for a given environment should include pedestrians. Many advocates for urban areas rightfully push for 25 mph limits for exactly that reason. If you want to successfully convert in town urban roads that are wide and have high speeds to 25mph there are two good options: speed calming measures or speed cameras.