tenji blocks

Do you know there are a rule in attatching tenji block?
First, the color is out standing color such as yellow.
This is for person who is weak eye sight. They can’t
Distinguish shape crealy, but they can distinguish
color and rough shape. So color help them when they walk.
Second, there are two type, and there is a each role
in attatching tenji block. One is for instructing stop,
and its surface are dots.
It is attached in a front of pedestrian crossing, bus stop,
or dangerous place. The other is for instructing go, and its surface is lines.
It is attached along the street.
These block help blind person decide whether go and stop.
Third, its surface is uneven in order to feel
surface in their stick.
If you see tenji block without knowing these rule,
you think only tenji block exist.
But with some knowledge, you find many mistakes, or
not working well. For example, the color is blown,
it is attached mistaking one for other,
it is flat, or there are bicycle on the tenji block.
Now, we claim that the world gradually become
barrier free, but it isn’t true.
The world of barrier free start in where everyone
have knowledge for disabled person.
(208 words)