speed limit signs

100kph 120kph 20mph 30mph 40mph 50mph 60mph 70mph 80kph 90kph advise alert alertness attention black blue care careful caution cautious command communication compulsory concept control danger dangerous design direct graphic hazard hazardous illustration importance inform information instruct instruction limit mandatory maximum notice obligation obligatory observations order people prohibited red regulation regulations required requirement road roads route safe safety sign signs speed symbol symbols traffic transport transportation vector vehicles warn warning white