guess maybe a big brown truck throws off a lot of heat and wind, and maybe it blows something closer to the cam and trips it
I have run cam's for about 20+ yrs and never had any get tripped by a vehicle past 50 yards, but honestly never run my cam's close to a road, so, guess its a new learning for me with them if trucks can trip then at FAR out like that LOL
also think maybe when I first replied here I thought I read 200 yards HAHA< I have bad eye's and maybe read it all wrong from the get go
60 yards sure sounds like more possible deal now I think about it!