[blimp]

even with the holder it is still supposedly illegal.
new guidelines were introduced not too long ago to strengthen some legislation, such as; no holding umbrellas while riding, max one child on your bike except if you use a double kickstand, no biking on the pavement except if you are below 13 (or was it 12) or above 70, or if it is dangerous (!)).

now, will you get stopped? in 99 cases out of 100, no. even coppers here in japan use the pavement (unfortunately). the only time you may get stopped would be if you got a passenger (who is above a certain age) on your bike. that or if the police wants to check whether it is your bike or not. if he/she asks for your arc make certain you ask for her/his ID.