Road signs in Australia

Road signs in Australia are regulated by each state's government, but are standardised overall throughout the country. In 1999, the National Transport Commission (NTC), created the first set of Rules of the Road for Australia. Australian road signs use the AS 1744:2015 fonts, which is the Highway Gothic typeface.
Australia closely follows the United States when it comes to road sign designing practices (for example, using yellow diamonds for warning signs and green direction signs), but some types of road signs in Australia, such as road signs for speed limits, roadworks, "reduce speed" signs, and chevron arrow-styled direction signs are influenced by the usage in the United Kingdom.
The very first standardised road signs in Australia used yellow circular signs as regulatory signs, a feature now preserved in "pedestrian crossing" and "safety zone" signs.
In 1964, Australia adopted a variation of the American Manual on Uniform Traffic Control Devices (MUTCD) road sign design, which is a modified version of the 1954 revised version of the 1948 American edition of the MUTCD. The Australian adopted version had differences from the American version that it used red "give way" signs instead of yellow "yield" signs, "no entry" instead of "do not enter", round pedestrian crossing road signs (a carryover from the early days), the adoption of some road signage designs from the United Kingdom, and the use of imperial system of units (miles and yards) as in the UK as opposed to the customary system of units (miles and feet) in the US.
The year of 1974 saw important changes in Australia's road sign design practices. A major change expressed Australia's preference for a transition to adoption of symbols on signs in lieu of words, inspired by the Vienna Convention on Road Signs and Signals, and transition to adoption of kilometres and metres in lieu of miles and yards. This change aligned with Australia's large-scale adoption of the metric system. Australian speed limit signs with red circle as a legend were placed in numbers greater than the numbers on those containing the legend "SPEED LIMIT". Speedometers on Australian vehicles were not required but encouraged to alter or replace the speedometer part so that it is shown in kilometres per hour. Except for bridge-clearance and flood-depth signs, dual marking was not used.
To avoid confusion as to whether the distance indicated was in miles or kilometres new major distance signs had affixed to them a temporary yellow plate showing the symbol km. On the many new kilometre signs on minor roads, a yellow plate which showed the corresponding number of miles was affixed under the now permanent kilometre distance indication. These temporary plates were removed between 1975 and 1976.
Regulatory signs inform drivers of traffic laws and banned actions. Road users must obey all instructions on prohibitory signs or risk getting a fine and points deducted from their licence. Local councils may have local restrictions relating to parking times, which would be shown on or near the sign.
Warning signs let drivers know that road changes are coming up on the drive. These can be permanent or temporary traffic hazards and obstacles. They use the yellow diamond design.
Guide and information signs give directions and information for scenic tourist routes and destinations such as rest stops and fuel stations. They also provide additional traffic information to guide driving.
Hazard markers indicate the direction to take when approaching the obstacle or driving past the hazard. Drivers must obey these signs.
Roadwork signs to keep you informed of changing conditions and to keep road workers safe. These signs closely follow United Kingdom design.
Please note that some plates have reduced due to the changing to alphanumeric plates in several states. Queensland has been partially alphanumeric, replacing all but around one metroad (because it is not applicable as M) with M roads, while New South Wales also had metroads but they were all replaced with straight alphanumeric plates along with national roads. Victoria is alphanumeric but partially numeric in the metropolitan area of Melbourne. Route shields around Australia come in many shapes and sizes.
The traffic lights for special vehicles have a letter on it. The GO light is white instead of green.