The need to change sides is given verbally.
Greatest safety is maintained by stopping before changing.
The person places their free hand on the back of the guide then releases the original grip. The person then trails across the back until reaching the guide's arm on the new side. On reaching the new side, check to ensure the person has taken the correct grip and position before continuing. The guide always approaches the kerb or stairs squarely, never at an angle, and stops at the edge. If using stairs, the guide should indicate if they are going up or down.