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The NTSB has at least implied that the crossing flasher red lights can be seen from over one mile away.  That raises an interesting question of the distance from which the lights are intended to be seen, and what a driver is supposed to do when he or she sees them.   <o:p></o:p> I don’t find anything in the MUTCD or other official guidance that details this information. You would think they would publish specifications about the distance projection of the lights.  As David K. Wheeler has pointed out in his post above, the RHGC handbook shows various angle and spread projection installations that seem to effect a maximum range of 1000 feet.  Is 1000 feet the intended design projection?  They don’t address that obvious question, and yet they discuss bulb wattage and power requirements.   <o:p></o:p> The state laws seem to deal only with events occurring in the immediate approach to the crossing.  They forbid crossing against the red flashing lights.  The laws also suggest that a driver must decide to yield to the lights when they become clearly visible.  “Clearly” is an interesting modifier because it implies that the lights might be visible without being clearly visible.  One might wonder if the lights seen from one mile in bright mid-day sun are clearly visible or just visible.
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