Africans was exhausted all options in responding to European imperialism. Some groups tried to shut down Europeans by not trading with them and not allowing missionaries to stay with them.
It's not illegal, but never have them on while driving unless you need to warn drivers behind you of a hazard or you're carrying something like for example: On freeways there are some semis and regular trucks who are hauling something/s and need to warn people that it's hazardous or to be careful when passing
