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[Vespa]

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[greenmeanie]

for anything with more than 2 wheels a lid isnt cumpolsory.
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Rh.

[yambabe]

Not quite right as you have to wear a helmet on an outfit, but no, you don't need one on a trike (although a lot of riders wear one by choice).
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Sod falling in love, I wanna fall in chocolate.

[BlackSheep]

[ratcliffe]

Yeah, the sidecar rider is optional, and on a trike no one has to. I think I would still wear one though, although I might go for something other than a traditional full face one on one.

[stinkwheel]

Some trikes you do, some you don't. It is done on a measurement, I think it was either kerb weight or axle width. Over a certain weight/width there is no requirement for a helmet but there is a requirement for a seatbelt.

Most people take the (usually correct) assumption that the police neither know or care about this and wear neither. If it is over the designated weight/width you need a seatbelt fitted for the MOT or SVA test

There are virtually no regulations regarding the provision of seating, handles, foot restraints, bodywork, state of inebriation or safety equipment for a sidecar passenger. If you are sat on the bike the same applies as for a solo machine.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Tarmacsurfer]

Technically the requirement is for a lap belt as opposed to a three point seatbelt, isn't it Stinkwheel?

I'm more than a little out of the loop however, may have changed that. Been a while since I had anything to do with trikes (owned a mantis briefly).
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I'm immortal. Well, so far.