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* Use contrasting colors: black on brown cardboard is not very good readable for passing drivers, black on white is far more readable
* Write only the initial letters in capitals. The human brain detects a word not only by combining a few letters, but also by recognizing the different ascenders and descenders (the heights of the different words). When writing only in capital letters you lose this advantage. That's why street signs respect the upper and lower case.
* In general, signs are useful when going out of a city, from which many roads start or if, for example, you have a junction 15 km. ahead and you do not want to walk, thus writing "TO THE JUNCTION".
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