In recent days I've noticed this this mudflap appearing on some heavy vehicles, like this cement truck:
Here's the sign in detail:
[Note to readers in drive on the right : passing on the left is an inside pass in .]
Such signs are available in other countries but I don't know how widespread is their usage. I like the idea, for two reasons: it shows that at some level the trucking industry is concerned about the safety of vulnerable road users, and it's a clear, simple message that's in the right place to be an effective reminder at just the right time.
By design the graphic is unambiguous and easy to comprehend in an instant, which is good for the approaching cyclist who may be processing any number of stimuli when they encounter a turning truck.
While it's not a mistake that I'm likely to make—I'm pretty wary of making inside passes on any turning vehicle (although I did make an unwise inside pass on a mini street sweeper the other day…)—there's really nothing wrong with a timely reminder not to do anything excessively risky.
Of course I'm not naïve enough to believe that a mere sign is enough to prevent all truck-bike collisions, but this must surely help. So I guess it would be good if these signs became standard on all trucks—but then I wonder if they could lose some of their effectiveness if they were 'everywhere'.
What do you think of this idea?