This depends on the country. For example, in Australia, signboards generally have green backgrounds. Brown backgrounds indicate tourist destinations, and there are also those with blue backgrounds. In other countries, the speed limit sign might have a white background, while signs indicating works on the road may have orange backgrounds. With such a variety of colours, it really depends. Black is probably not used, as it it hard to see anyway.
Road signs on the motorways are blue with white writing.
In the UK it is an emergency diversionary sign for motorways and primary routes.
you put tar on the road
Round signs give orders, normal triangle signs give warnings and rectangular signs give useful information (the background colour of these describes the road by the way).
26% in the UK.
It means an 'A road', the country's main roads after the busiest, the Motorways.
because people cross the road more in built up areas but dont on motorways
white is the colour which we can see from the maximum distance and red is a alert signal or danger signal and has good reflections also.
No that road is free and rel;atively trafic free compared to UK Motorways
The warm air currents over motorways are primarily due to the heat generated by vehicles as they drive on the road. This heat warms up the air directly above the road, creating a phenomenon known as a heat island effect. Additionally, the dark asphalt of the road absorbs more sunlight, further contributing to the warming of the air currents over motorways.
Danger signs are always triangular, on any roads and motorways in France.
There is no motorway, but the A14 is a busy road which Birmingham to Ipswich, which is not far from Norwich.