S1: At the roadside the driver will be asked to blow through a small glass tube into a plastic bag.

S6: The driver will be asked to go to the police station.

P: And if the colour change does not reach the line the driver cannot be punished under the new law.

Q: Inside the tube are chemically treated crystals which change colour if the driver has alcohol on his breath.

R: But if the colour change does reach the line then the test has proved positive.

S: If the colour change goes beyond a certain line marked on the tube this indicates that the driver is probably over the specified limit.

The proper sequence should be:

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