Zealand, if you use UHF PRS for emergencies, you rely on someone listening on the same channel, and should scan all channels for activity before requesting assistance. Channel 9 is the designated emergency channel in Malaysia. Channel 11 is the 'call channel' and is only to be used for initiating calls with another person, who should quickly organise another vacant channel to continue their discussion, unlike New Zealand which uses channel 11 as its main trucking channel. Channel 22 and 23 are only to be used for telemetry and telecommand. Packet data and voice transmission are not allowed. Channel 61, 62 and 63 are reserved for future allocation and transmission on these channels is not allowed. Channels used by consensus The following channels are not legislated as a part of the class licence however are used for the following purposes by consensus. Channel 10 is typically used by 4WD clubs when in a convoy and in national parks. This channel is used to avoid interfering with road safety communications on channel 29 or 40. If you are not in a convoy it is recommended that only 29 or 40 are used, depending on the road in question. Channel 18 is the campers and caravan convoy channel typically used by travellers. Channel 29 is the road safety channel on the M1 Pacific Motorway and Highway between Tweed Heads and Newcastle in NSW. It is used due to one transport company who travelled this road who always used this channel. Other drivers switched from 40 to 29 to talk to them and it became a custom. This custom prevails even though the original transport company no longer exists. Channel 40 is the primary road safety channel Australia-wide, most commonly used by trucks including pilot/escort vehicles for oversized loads. Users should be aware that UHF CB channels 31 to 38 and 71 to 78 are the 'input' channels for repeaters. Users should avoid using these channels to avoid interfering with repeaters. If a repeater is to be used, switch to 1–8 or 41–48 and press the duplex button. UHF CB band plan Expansion to 80 channels On 27 May 2011 the channel spacing on UHF CB was changed, allowing the band to expand from 40 channels to 80 channels. Due to data channels 22 and 23 occupying 25 kHz bandwidth, the expansion effectively allows the use of 77 channels, as channels 61, 62