Another 'traffic calming' measure found here in Ottawa, Canada is zig-zagging lane configurations, forcing drivers to swerve left and right when entering or exiting intersections. This becomes dangerous when the pavement is covered in snow. The locals, used to the funky arrangement, will swerve, much to the panic of out-of-towners wondering why the fsck is this guy is driving into his lane.

It should be noted that emergency vehicles are also affected by such measures, so in reality, someone somewhere may die because an ambulance could not reach him in time.