UK and Europe · Public discussion

Flashing Lights Now Legal

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UK and Europe
Published
16 September 2005
Last activity
19 September 2005
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  1. Latest e-mail from CTC. Legal changes will make flashing lights legal
    from October.

    "Flashing legalised

    Following sustained campaigning by CTC, the UK's national cyclists'
    organisation, and just in time for when the clocks go back this year,
    it should at last become legal to use flashing lights on your bike. The
    Minister of State, Dr Stephen Ladyman, this week signed the order; and
    provided there are no parliamentary objections before then, it should
    become law in October.
    The details were decided in close consultation with CTC's technical
    officer, Chris Juden, who said: "This is a welcome liberalisation of
    cycle lighting law because provided they are bright enough, flashers
    front and rear will not only be legal, but will be all the lights you
    need."
    In brief, to be legally approved a light may flash at least once and
    not more than four times per second with a brilliance of at least four
    candle-power. Most of the better quality flashing lights on sale today,
    meet that simple requirement.
    Unfortunately DfT felt unable to make any changes beyond the matter of
    flashing lights. This will have some strange and unintended
    consequences. Since lamps emitting a steady light must still conform
    with BS6102/3 and all that entails, it now becomes much simpler to be
    legal by flashing than not! DfT are aware of this paradox and intend to
    add a recommendation to the Highway Code (currently also under review)
    to use a steady headlamp on unlit roads.
    CTC continues to campaign for a similar, simple legal approval of lamps
    emitting steady light, and for a permitted alternative to pedal
    reflectors in cases where these cannot be used or seen. Until then:
    cyclists who sensibly light their way with one of those brilliant
    rechargeable headlamps, that emit thousands of candle-power but are
    non-the-less, non-BS, can most easily make themselves legal by also
    fitting a little 4-candela flasher. "

    Iain

  2. <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In brief, to be legally approved a light may flash at least once and
    not more than four times per second with a brilliance of at least four
    candle-power

    I'd like the police to try and time the flashes on my F+R Cateye lamps.

    --
    Simon Mason
    http://www.simonmason.karoo.net

  3. Simon Mason said:

    <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    In brief, to be legally approved a light may flash at least once and
    not more than four times per second with a brilliance of at least four
    candle-power

    I'd like the police to try and time the flashes on my F+R Cateye lamps.

    also, a lot of the onesin 'constant' mode actually flash, but at a speed
    which is not normally discernable to the eye. I remember measuring some
    at about 120Hz. I dare say a quick test would be to shine one at a
    wheel and see if a stroboscopic effect could be made to get the spinning
    whel to look at a standstill.

    --
    There will never be true sexual equality until women accept that the
    default position of a toilet seat is UP

  4. Pete Whelan said:

    at about 120Hz. I dare say a quick test would be to shine one at a
    wheel and see if a stroboscopic effect could be made to get the spinning
    whel to look at a standstill.

    Hold it at arms length, facing towards you in a darkened room and wave
    your arm rapidly side-to-side.

    Best to detach it from the bike first.

    regards, Ian SMith
    --
    |\ /| no .sig
    |o o|
    |/ \|

  5. "Ian Smith" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:


    Hold it at arms length, facing towards you in a darkened room and wave
    your arm rapidly side-to-side.

    Best to detach it from the bike first.

    regards, Ian SMith

    If left attached to the bike, it does provide a bit of weight training
    though - valuable during the winter months as preapration for next season.

    Cheers, helen s

  6. Ian Smith said:
    Pete Whelan said:

    at about 120Hz. I dare say a quick test would be to shine one
    at a wheel and see if a stroboscopic effect could be made to get
    the spinning whel to look at a standstill.

    Hold it at arms length, facing towards you in a darkened room and
    wave your arm rapidly side-to-side.

    Best to detach it from the bike first.

    And, of course, to switch it on. :-)

    Another technique that might show the strobe effect would be to use the
    lamp to backlight a stretched elastic band. Twang the band and a strobe
    will produce a wiggly visual effect instead of the more familiar
    vibrational blur. Try it in front of you computer monitor if you still
    have a traditional CRT one.

    --
    Dave...

  7. Pete Whelan said:


    also, a lot of the onesin 'constant' mode actually flash, but at a speed
    which is not normally discernable to the eye. I remember measuring some
    at about 120Hz. I dare say a quick test would be to shine one at a
    wheel and see if a stroboscopic effect could be made to get the spinning
    whel to look at a standstill.

    Just wave it about at arm's length - you'll see sort of dashed lines if
    it's flashing.

    --
    Andrew

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