2 Read the text about safety signs. Write these four headings in the correct places.
a Green and white squares or rectangles
b Black and yellow triangles
c Red and white circles
d Blue and white circles

Safety signs: colours and shapes
Safety signs are very important because the oil and gas industry has many hazards. (Hazards = possible dangers like electricity, chemicals, hot things, gas, machines, noise, falling objects, and slippery surfaces). There are four main kinds of safety sign:

1
These signs warn us about hazards. The signs give warnings like Danger! Overhead crane or High voltage.

2
These signs usually have a red band across them. They tell us we must not do things. For example Do not smoke here or Do not switch off this machine.

3
These signs tell us 'You must wear or do the thing in the picture'. For example Wear goggles or Read the instructions before you use the machine.

4
These signs give information about safety. For example, they tell us This way to the emergency exit or Lifejackets are here.