In this section, the following term is used with the meaning indicated:
"variable" (as a noun) means a feature or property (e.g., a dimension, a physical condition such as temperature, a quality such as density or colour) which, in respect of a particular entity (e.g., an object, a quantity of a substance, a beam of light) and at a particular instant, is capable of being measured; the variable may change, so that its numerical expression may assume different values at different times, in different conditions or in individual cases, but may be constant in respect of a particular entity in certain conditions or for practical purposes (e.g., the length of a bar may be regarded as constant for many purposes).
Attention is drawn to the definitions of terms or expressions used, appearing in the notes of several of the classes in this section, in particular those of "measuring" in class Fulltext... Hierarchy... Expanded...G01 and "control" and "regulation" in class Fulltext... Hierarchy... Expanded...G05.
Classification in this section may present more difficulty than in other sections, because the distinction between different fields of use rests to a considerable extent on differences in the intention of the user rather than on any constructional differences or differences in the manner of use, and because the subjects dealt with are often in effect systems or combinations, which have features or parts in common, rather than "things", which are readily distinguishable as a whole. For example, information (e.g., a set of figures) may be displayed for the purpose of education or advertising (Fulltext... Hierarchy... Expanded...G09), for enabling the result of a measurement to be known (Fulltext... Hierarchy... Expanded...G01), for signalling the information to a distant point or for giving information which has been signalled from a distant point (Fulltext... Hierarchy... Expanded...G08). The words used to describe the purpose depend on features that may be irrelevant to the form of the apparatus concerned, for example, such features as the desired effect on the person who sees the display, or whether the display is controlled from a remote point. Again, a device which responds to some change in a condition, e.g., in the pressure of a fluid, may be used, without modification of the device itself, to give information about the pressure (Fulltext... Hierarchy... Expanded...G01L) or about some other condition linked to the pressure (another subclass of class Fulltext... Hierarchy... Expanded...G01, e.g., Fulltext... Hierarchy... Expanded...G01K for temperature), to make a record of the pressure or of its occurrence (Fulltext... Hierarchy... Expanded...G07C), to give an alarm (Fulltext... Hierarchy... Expanded...G08B), or to control another apparatus (Fulltext... Hierarchy... Expanded...G05).
The classification scheme is intended to enable things of a similar nature (as indicated above) to be classified together. It is therefore particularly necessary for the real nature of any technical subject to be decided before it can be properly classified.
indicating the position of vehicles for traffic control purposes; [7]
navigation systems for traffic control purposes, i.e. systems in which the navigation is not performed autonomously by or in the vehicles, but where the vehicles are guided by instructions transmitted to them; [7]
with provision for compensation of environmental or other condition, e.g. snow, vehicle stopped at detector [5]
G08G 1/052
· ·
with provision for determining speed or overspeed [5]
G08G 1/054
· · ·
photographing overspeeding vehicles [5]
G08G 1/056
· ·
with provision for distinguishing direction of travel [5]
G08G 1/065
·
by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
G08G 1/07
·
Controlling traffic signals
G08G 1/08
· ·
according to detected number or speed of vehicles
G08G 1/081
· ·
Plural intersections under common control [5]
G08G 1/082
· · ·
Controlling the time between beginning of the same phase of a cycle at adjacent intersections [5]
G08G 1/083
· · ·
Controlling the allocation of time between phases of a cycle [5]
G08G 1/085
· ·
using a free-running cyclic timer
G08G 1/087
· ·
Override of traffic control, e.g. by signal transmitted by an emergency vehicle [5]
G08G 1/09
·
Arrangements for giving variable traffic instructions (indicating arrangements for variable information by selection or combination of individual elements Fulltext... Hierarchy... Expanded...G09F 9/00)
G08G 1/095
· ·
Traffic lights
G08G 1/0955
· · ·
transportable [5]
G08G 1/096
· ·
provided with indicators in which a mark progresses showing the time elapsed, e.g. of green phase
G08G 1/0962
· ·
having an indicator mounted inside the vehicle, e.g. giving voice messages [5]
G08G 1/0965
· · ·
responding to signals from another vehicle, e.g. emergency vehicle [5]
G08G 1/0967
· · ·
Systems involving transmission of highway information, e.g. weather, speed limits (transmission of navigation instructions to the vehicle Fulltext... Hierarchy... Expanded...G08G 1/0968) [5]
G08G 1/0968
· · ·
Systems involving transmission of navigation instructions to the vehicle [5]
G08G 1/0969
· · · ·
having a display in the form of a map [5]
G08G 1/097
·
Supervising of traffic control systems, e.g. by giving an alarm if two crossing streets have green light simultaneously
indicating individual free spaces in parking areas
G08G 1/16
·
Anti-collision systems (road vehicle drive control systems for predicting or avoiding probable or impending collision otherwise than by control of a particular sub-unit Fulltext... Hierarchy... Expanded...B60W 30/08) [2,8]