In the US, the FCC has reserved channel 9 for emergency or traveler assistance use only. Use of this channel should only be for issues involving personal safety, damage to property or other required assistance. Channel 9 is also reserved for emergency use in most other countries that allow Citizen Band radio.

When using this channel for emergencies or assistance, clearly identify the nature of the problem and your location. If no response is received, try other channels or find another way to get help.