When attached to poles, they may be stacked onto each other in alternating directions or mounted perpendicular to each other, with each sign facing the street it represents.
Los Angeles and San Francisco started in the 1970s and recently New York City has introduced the bigger signs at its intersections.
In 2013, New York City began to change street signs that have been previously used Highway Gothic font for a new one, Clearview, that include both upper and lower case letters, which is considered more readable.
[1] Usually, the color scheme used on the sign just reflects the local standard (for example, white letters on a green background are common throughout the US).
The city of Houston, Texas, allows for street name signs in several of its neighborhoods (usually part of a management district, where property owners assess additional fees to themselves to pay for extra services) to be of significantly different color schemes and fonts from the citywide standard.
In 1952 in the UK, David Kindersley submitted a design, MoT Serif, to the British Ministry of Transport, which required new lettering to use on United Kingdom road signs.