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Where is the photon when the car is at the square flag? For Tom the photon is at the triangle flag. For you the photon is at the cabin. By exchanging your experiences you both come to a mindboggling conclusion: The photon must be at the triangle flag AND at the cabin. Both 'photon at triangle flag' and 'photon at cabin' coexist when the car is at the square flag. That's only possible if the photon's complete life of past, present and future events exists! Similar scenarios show that not only the photon's complete life, but also your complete life, Tom's complete life, and the car's complete life exists in Spacetime! All the events of total Spacetime coexist! 

=> Go to ....
 Introduction
 Relativity for Dummies
 4D Spacetime Block Universe
 Reciprocal time dilation
 Reciprocal length contraction
 Lengths do not 'appear' contracted!
 Measuring the contracted train
 Constant light speed
 Where is the bullet?
 Train experiment
 Slower and shorter  case study
 Minkowski vs Loedel
 Spacetime video
 Further reading