• There are different patterns for different messages - not just generic bumps
• Dots in a grid mean a dropped curb for crossing the road
• Offset dots, i.e. not aligned, mean there’s a train platform and possibly a gap!
• Lozenges mean that there’s a tram crossing
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• Horizontal stripes mean there are stairs or an obstacle ahead of you but vertical stripes mean a safe path to follow
• The pavement can be colour coded - for example, bright contrasting colours help partially sighted people to understand if they’re at a traffic lights crossing