What type of tactile block is used on off-street platform edges?

The use of offset blister tactile blocks on off-street platform edges is essential for providing guidance to individuals with visual impairments. These tactile blocks feature raised, dome-shaped protrusions that can be easily felt underfoot. They are designed to alert users when they are approaching an edge, such as a train platform, where there may be a drop or a potential hazard.

Offset blister blocks are strategically placed to ensure they can be detected even when the user is not directly approaching the edge. This increases safety and accessibility for people who rely on tactile cues to navigate their surroundings. Their specific design and placement help create a recognizable pattern that alerts individuals to approaching the boundary, effectively aiding in their orientation and mobility.

In contrast, other tactile block types serve different purposes. For instance, flat tactile blocks may be used in various places but do not provide the specific guidance required at platform edges. Standard bumps and raised stripes have different tactile characteristics that might not provide the necessary warning needed for edge detection in an off-street platform context.