Mandatory signs are usually visible on the streets and in public places and are usually intended to provide the public with information and guidelines for general road rules. They usually have a round shape with a white frame around and the corresponding symbol embossed on the blue border. Although mandatory warning signs are easily seen and understood by people, they are not of great importance for people with impaired vision.
Most people with impaired vision retain some sense of vision with increased sensitivity to yellow. Moreover, they are more concerned with information obtained by touching to move safely. Therefore, mandatory signs for them should be aimed at creating a contrast between the environment and the walking surface, so that they can feel that way during the movement.
Required W Arning Signs for the visually impaired
Non-visual mandatory signs, such as tactile devices and sound signals, convey information about the environment to the blind, which are necessary for their safe movement. Visual contrast with a special emphasis on yellow color is important to emphasize the presence of certain key features in an environment that the blind should know about.
When creating mandatory guidelines for them, some design principles should be kept in mind. Simple, consistent layouts with a logical implementation allow the blind to memorize the environments they regularly visit. Consistency also helps them interpret and predict the environment they may encounter for the first time.
Tactical tones
Audible tactile motion signals (ATTS) provide sensory and audible information about their immediate surroundings. They have audible features that help blind people find signals and provide them with information about the status of the road. They also have tactile functions that help them with their orientation.
Tactile ground level indicators
Tactile ground surface indicators (TGSI) provide pedestrians with sensory and visual information. They additionally use the color yellow color & # 39; and a pre-set pattern of truncated domes or cones or rods to create significant contrast between the environment and the walking surface.
Textured indicators and colored yellows are easily detected, helping them to move safely. Mandatory TGSI is commonly found on stairs, train stations and airports, walkways and other ground surfaces in public places that are often visited by visually impaired people.
TGSI categories
TGSI is available in two categories: directivity indicators and warning indicators.
Directional Indicators - Directional indicators are used in places where tactile signals, such as the edge of a border or a line of properties, are missing or do not give clear indications. They are used for directional orientation and indicate a continuous, without dangerous access path of movement. They are usually found at road crossings, access points to public transport, public objects, around obstacles on footpaths, etc.
Warning Indicators - Warning signs are used in the same way as a stop sign to help the visually impaired to detect any imminent danger in their path. Such indicators are usually found in areas where danger to life may be present, for example, at the edge of railway platforms, at the edge of a staircase or escalator, overhead hazards, such as arches, at the edge of all walkways, etc.
