Road signs in Singapore

Road signs in Singapore closely follow those laid down in the United Kingdom's traffic sign regulations, although a number of changes over the years have introduced some slight deviations that suit local road conditions (such as fonts). Road signs in Singapore conform to the local Highway Code under the authority of Singapore Traffic Police.
The typeface used, which is regulated by the Land Transport Authority, has no official name. It is also used on road signs in Brunei.
Since the mid-1990s, signs have been placed on a backing board, making them square or rectangular and standardised to a width of 600 mm on most roads and 900 mm on expressways. Prior to the 1990s and after 1964, signs were cut out to their shape (for example, round signs were cut to be circular) as in most countries around the world. Prior to 1964, signs were in the pre-Worboys style with a couple of differences.
Singapore traffic signs display text in English, one of the four official languages and the main language in the country. The three others – Malay, Chinese, and Tamil – as well as Japanese are also used for important public places such as tourist attractions, airports and immigration checkpoints.
Warning signs indicate possible dangers or unusual conditions ahead and alert motorists, so they may anticipate the appropriate actions to take. They are usually shaped as triangles with a red border, and mounted on a borderless white backing board.
Regulatory signs either mandatory, which give positive instructions, or prohibitory, which indicate a prohibition. Many regulatory signs are accompanied by supplementary plates that provide interdependent exceptions to the rule, or indicates additional instruction or information to facilitate understanding of the rule implemented.
Mandatory signs are generally circular with a white border and symbol on a blue background. They usually indicate something all drivers must do (e.g. keep left) or a facility available to certain classes of traffic (e.g. pedal cycles only).
The exceptions are the octagonal red STOP sign, the temporary STOP and GO signs and the triangular GIVE WAY sign.
Prohibitory signs, which generally tell drivers what they must not do, are mostly circular and have a red border. The red ring indicates the prohibition; diagonal bars are used only on signs which prohibit a specific manoeuvre, i.e. banned left or right turns and U-turns, or a certain class of vehicle, i.e. lorries
Diagonal bars are excluded when restrictions are quantitative in nature, i.e. limits in speed, weight, axle, height, and width.
Information signs are signs that may be mounted to indicate a certain condition or nature of the road ahead that motorists need to take note. They are independent of existing mandatory and prohibitive signs. Such signs are usually white or blue and rectangular in shape.
Temporary work-zone signs (designated in amber orange signages) are mounted to ensure road users are notified in advance despite being affected by road works in the vicinity. It closely follows the American MUTCD traffic sign (e.g. reddish orange diamond, reddish orange rectangular or amber rectangular-shaped signs).
The following signs are historical, and are now obsolete.