ext_59038 ([identity profile] palatinate.livejournal.com) wrote in [personal profile] tamaranth 2007-09-16 11:28 am (UTC)

Still usually two I think - see here (http://www.stvincent.ac.uk/Resources/Physics/Speed/road/redlt.html), for instance. They still need to demonstrate the speed at which you crossed the light.
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