1. An area or region where a specific signal can be received or transmitted, such as cellular, radio, or wireless signal coverage
The mobile phone has good reception in this signal zone.
O telefone celular tem boa recepção nesta zona de sinal.
2. A designated area in transportation or communication systems where specific signals are valid or applicable
The train must reduce speed when entering the signal zone.
O trem deve reduzir a velocidade ao entrar na zona de sinal.