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Signal Requirements

13 Unless otherwise specified in sections 4F.03 and 4G.04, the same signal path shall not be used to display both a flashing yellow indicator and a yellow steady-state indicator. Unless otherwise specified in clauses 4D.18, 4D.20, 4D.22 and 4D.24, the same signal section shall not be used to display both a flashing red indicator and a steady state fixed red indicator. 14/ Signal sights larger than 12 inches may not be used on freely oscillating signal surfaces. 07 The signal section indicating a flashing yellow sign in stationary mode: 04 Except as referred to in paragraph 5, when a traffic control signal is activated in flashing mode, only one signal indicator shall flash on each signal surface at the indicated location. 03/ When switching from yellow-red flashing mode to stop-and-go mode, if there is no common green interval for main roads, consideration should be given to providing a constant red distance interval for other access roads before switching from a flashing yellow or flashing red signal indicator to a green signal indicator on the main approach. The emergency flag must measure at least 3 x 3 feet with a black square and a ball on an orange background. It is only accepted as a daytime signal and is particularly effective in direct sunlight. The flag is most noticeable when it is swung at something like a paddle or boat hook, or flies off a mast. Standard: 04 Signal surfaces intended to approach with a common left/right turn lane and without transit movement shall be one of the following: Hand distress signals are very common. Be sure to hold the torch with a glove and keep the smoke downwind of your boat. Support: 01 Road markings (see Part 3), which clearly communicate the operational plan of an intersection to road users, play an important role in the effective operation of traffic control signs.

By determining the number of lanes, the use of each lane, the length of additional lanes when approaching an intersection, and the right stopping points, the engineer can design the phases and timing of signals to best meet the objectives of the operational plan. Support: 11 Figure 4D-2 shows some of the typical arrangements of signal sections in signal surfaces that do not control separate rotational movements. Figures 4D-6 to 4D-12 illustrate the typical arrangement of signal sections in the left indicator surfaces. Figures 4D-13 to 4D-19 illustrate the typical arrangement of signal sections in the surfaces of the right-hand indicators. 09 The corresponding signal indicator RED ARROW or YELLOW ARROW shall flash when a signal surface consists exclusively of arrow indicators. A signal surface consisting exclusively of arrow indicators that provides only protected steering in stop-and-go mode or that provides a flashing yellow or flashing red arrow for permissive cornering in stop-and-go mode, the YELLOW ARROW signal indicator may flash in flashing mode if the adjacent pass-movement indicators are flashed amber and is intended to: a permissive cornering motion which does not need to be completely stopped by each turning vehicle shall be provided in flashing mode. Option 05 Since special signals in the centre block that flash yellow in a circular manner in the position normally occupied by the green signal indicator do not have a green signal indicator in the signal area, these signals may change directly from flashing circular yellow (in the position normally occupied by the green signal indicator) to solid yellow without first switching to a green signal indicator. 11 Section 4D.13 contains provisions on the lateral positioning of signal surfaces controlling left-hand turn movements.

Option: 05 In a vertically arranged signal surface, signal segments indicating signal indicators of the same color may be arranged horizontally next to each other perpendicular to the basic straight layout to form a grouped signal surface (see Figures 4D-2, 4D-9, 4D-11, 4D-16 and 4D-18). Support: 01 Traffic light signs are sometimes used on traffic lights to instruct or guide pedestrians, cyclists or motorists. Signs generally used on or on access roads to marked locations include prohibition signs (see section 2B.18), lane control signs (see sections 2B.19 to 2B.22), pedestrian crossing signs (see section 2B.51), pedestrian control signs (see section 2B.52), traffic lights (see sections 2B.53 and 2C.48), “Sign forward” warning signs (see section 2C.36), traffic signs (see section 2D.43) and Advance Street Name signs (see section 2D.44). 12/ If a traffic control signal changing from dark to stationary mode (usually after recovery from a power failure) receives a request for pre-emption or priority, care should be taken to minimise the possibility of vehicles or pedestrians being brought into conflict with the requesting vehicle. 10/ The following combinations of signal indicators shall not be displayed simultaneously on a signal surface: For horizontally arranged signal surfaces, the YELLOW ARROW signal lens is located immediately to the left of the GREEN ARROW signal lens. If a two-arrow signal section (which can switch between the display of a GREEN ARROW and a “YELLOW ARROW” signal indicator) is used, the signal lens with the double left turn arrow shall be located immediately to the right of the CIRCULAR YELLOW signal lens; the signal lens with a right GREEN ARROW is located immediately to the right of the CIRCULAR GREEN signal lens. and the right-turn double-boom signal lens shall be to the right of all other signalling lenses. Standard: A temporary traffic control sign is defined as a traffic control sign installed for a limited period of time. A portable traffic control signal is defined as a temporary traffic control signal designed to be easily transported and reused at different locations.

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