There's a small feature on almost every footpath in Ireland that most of us have never consciously noticed. Where the footpath meets the road, instead of a sharp drop, there's a gentle slope. A dip. A smooth transition from one level to the other.
You probably rolled a suitcase over one this week. Maybe you pushed a buggy across one. Perhaps you cycled over one without thinking, or appreciated one on a day your knees were sore, or used one to wheel in a delivery trolley.
That slope was designed for wheelchair users.
It wasn't designed for you. And yet here you are, using it constantly, your life made marginally but measurably easier by a design decision that was originally made with someone else in mind.
This is the Curb Cut Effect. And once you understand it, you will never look at accessibility the same way again.
01. Captions on video
For disabled users: Captions are essential for deaf and hard-of-hearing users who would otherwise have no access to spoken video content whatsoever.
For everyone else: The majority of social media video is now watched without sound. Commuters, people in open-plan offices, anyone scrolling in a shared space. Captions also improve comprehension for people watching in their second language, help viewers follow technical or unfamiliar terminology, and make video content indexable by search engines, improving your reach organically.
02. Colour contrast
For disabled users: Sufficient contrast between text and background is essential for people with low vision, colour blindness, and visual processing differences. Without it, content is simply unreadable for a significant portion of your audience.
For everyone else: Most web browsing happens on mobile, outdoors, in variable light conditions. Strong contrast makes your content readable on a cracked screen in direct sunlight, in a dimly lit room at night, and everywhere in between. It also ages well. As people's eyesight naturally changes over time, higher contrast content remains legible when lower contrast content stops being so.
03. Plain language and clear structure
For disabled users: People with cognitive differences, dyslexia, ADHD, and acquired brain injuries rely on clear, simply written content and logical page structure to understand and navigate information without unnecessary effort.
For everyone else: Research consistently shows that the vast majority of web users skim rather than read. Short sentences, plain language, clear headings, and logical structure serve every user who is busy, distracted, reading quickly, or simply human. The legal profession learned this the hard way. Plain English contracts get fewer disputes. The same principle applies to every word on your website.
04. Keyboard accessibility
For disabled users: People with motor disabilities, tremors, or conditions that make precise mouse control difficult or impossible depend entirely on keyboard navigation to move through a website and complete actions.
For everyone else: Keyboard accessibility is what makes your site usable for power users who prefer shortcuts, professionals moving quickly between tools, and anyone using a smart TV, games console, or device without a traditional pointer. It also tends to reflect cleaner, better structured code underneath, which means faster load times and better search engine performance as a byproduct.
05. Logical heading structure
For disabled users: Screen reader users navigate pages almost entirely by jumping between headings. A broken or missing heading structure makes a page effectively unusable for someone who cannot see the visual layout and relies on the underlying structure to understand what a page contains and where to go.
For everyone else: Clear headings help every user skim a page and find what they need quickly. They also signal to search engines what a page is about and how it is organised, directly supporting SEO performance. A well-structured page ranks better, converts better, and serves every visitor more effectively.
The pattern is not a coincidence
Every one of these improvements was designed to remove a barrier for a specific group of people. Every one of them ended up making things better for a much wider audience. That is not luck. It is what happens when you design for the full range of human experience rather than the imagined average user sitting at a desktop in perfect conditions.
The average user is a fiction. People use websites when they are tired, distracted, rushed, in poor light, on slow connections, on small screens, in noisy environments, and with varying levels of digital confidence. The edges of usability are not occupied only by people with diagnosed disabilities. They are occupied, at various times, by almost everyone.
When you design for the edges, you design for reality.
What this means for Irish businesses
The European Accessibility Act is now in force in Ireland. For many businesses, the conversation about accessibility starts and ends with compliance. Something that needs to be sorted, budgeted for, and signed off.
The curb cut effect reframes this entirely. Accessibility investment is not a cost you absorb to serve a minority. It is an improvement to your product that benefits your entire audience, lifts your search performance, reduces your legal exposure, and signals to every visitor that your organisation takes quality seriously.
The return on accessibility investment is systematically underestimated because organisations only count the users they were explicitly designing for. They don't account for the much larger group who benefits quietly, every single day.
The slope on the footpath wasn't designed for you. But it was there when you needed it. That is not a consolation prize for good ethics. That is what good design looks like.