Tactile paving (also called tenji blocks, truncated domes, detectable warnings, tactile tiles, tactile ground surface indicators, tactile walking surface indicators, or detectable warning surfaces) is a system of textured ground surface indicators found at roadsides (such as at curb cuts), by and on stairs, and on railway station platforms, to assist pedestrians who are visually impaired.

Tactile warnings provide a very distinctive surface pattern of truncated domes, cones or bars, detectable by a long cane or underfoot, which are used to alert the vision-impaired of approaching streets and hazardous surface or grade changes. There is disagreement between the design and user community as to whether installing the aid inside buildings may cause a tripping hazard.

A system of tactile paving was first instituted in Japan at pedestrian crossings and other hazardous road situations; the United Kingdom, Australia and the United States picked up the standard in the early 1990s. Canada started incorporating them into transportation first in the 1990s, and then added them to other aspects of the built environment in the early 2000s.

Tactile paving was first developed in 1965 by Seiichi Miyake, who was inspired by braille (the term "Tenji blocks" comes from tenji, the name for Japanese braille). The paving was first introduced in a street in Okayama, Japan, in 1967. Its use gradually spread throughout Japan and then around the world. Tactile paving is widely used in subway stations and sidewalks.

Today, yellow tactile paving is ubiquitous in Japan. For aesthetic reasons, for example in front of hotels, the colour of the paving might be non-standard, to match the colour of the pavement or stone floor. Sometimes the paving contours are produced with steel stripes and dots.

Tactile tiles spread rapidly after their adoption by Japan National Railways (later known as Japan Railway). In 1985, the system was formally named "Hazard Guide for the Vision Impaired" (視覚障害者誘導用). Its modern form can be classified into two types: one has small, round bumps upon the surface of the block, which are felt through a sole (known as warning block), and the second is a directional aid, with long, slender bumps being installed on the surface (known as directional block).

However, many types have been manufactured and installed as an experiment. This has resulted in a situation which may be confusing for both the vision-impaired and the elderly. Usually the color of a tile is used to check the proper direction. If the color is not the usual one, there may be confusion. That has led to the standardisation of the system throughout Japan.

Now, the use of tactile tiles is spreading throughout the world. Many tactile tiles have been installed at subway stations and on sidewalks in Seoul, Korea. The installation in Seoul is more challenging than in Japan, because the surface of various sidewalks in Seoul is not flat, so there are many places where the meaning of a tactile tile is not clearly conveyed.