  A. Compressive strength is highly relevant for stationary objects.
All four of the ecoraster grades exceed the loadbearing requirements for any/all vehicles allowed, in the United States of America, on all federal and state roadways, as well as other developed nations.
B. Compressive strength is only minimally relevant to pavement engineering for vehicular traffic surfaces, it determines:
"When the vehicle is stationary,
will the pavement and/or the pavement driving surface support the weight of the stationary object?"
C. More highly relevant to vehicular traffic surfaces are the tensile strength + resistance to horizontal forces (i.e the forces exerted by vehicles in motion). The relevant defining questions are:
1 - "When the vehicles accelerate or decelerate (brake),
will the horizontal torsional forces decay, deconstruct or disassemble either the pavement, or the pavement surfacing?"
2 - "When the vehicles execute turns at velocity,
or when the steering axles are rotated while stationary,
will the the rotational torsional forces disconnect or deconstruct either the designed + executed pavement, or the driving surface?"
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D. Most relevant factor: FHWA Studies and Documentation regarding the relevant factors in the durability + expected lifespan of traffic pavements and surfaces:
1 - Since the 1960s, and into the latter part of the 21st century, we have known that the most relevant factor effecting a highly durable + long-lived traffic surface is the rigidity versus flexibility of the driving surface.
2 - The more rigid the pavement surface = the more susceptible it is to deconstruction by typical vehicular traffic.
3 - The more flexible the pavement surface = the less susceptible it is to deconstruction by the exact same traffic.
4 - This is a known engineering fact, which is applicable not only to roadways, but is applicable to all built environments:
(i) when severe dynamic forces are exerted on any structure, its ability to flex and recoil allows surviveability;
(ii) whereas the same dynamic forces will cause a rigid structure to fracture.
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