This is a prob I've dealt with for years on a motorcycle. I usually make a right,then hook a U-turn and wait at the light to go straight. If the traffic is heavy,I'll pull up as far as is prudent and let a car behind me trigger it. I've also had hit-or-miss success shutting off my engine and restarting to get the electric starter to trigger the light. On a bicycle,I'd prolly cross the intersection,stop and turn the bike,and then ride straight with the light.
They make strong magnets that strap onto the frame or kickstand for motorcycles. I've heard various reports as to their effectiveness. Might want to look into trying one of these.
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C'dale BBU('05 and '09)/Super Six/Hooligan8and 3,Kona Dew Deluxe,Novara Buzz/Safari,Surly Big Dummy,Marin Pt Reyes,Giant Defy 1,Schwinn DBX SuperSport,Dahon Speed Pro TT,Brompton S6L/S2E-X
