1. Introduction

Brakes are one of the most important parts of a car. However, if normal brakes are applied in an emergency on a slippery road, the car wheels may lock and the vehicle may skid, i.e. slide uncontrollably. That is why brakes are equipped with an anti-lock braking system, aka ABS. This system, which prevents wheels from locking, is going to be discussed in the unit.

 

Contents:

Defining and non-defining clauses and the present participle used for their reductions:

These cables allow electricity distribution over long distances. They have been installed. This will make the development project possible.

= Cables which allow electricity distribution over long distances have been installed, which will make the development project possible.

= Cables allowing electricity distribution over long distances have been installed, making the development project possible.