The rate of evolution in highway products is very slow compared to electronic, medical or communication products. If you think back to the 1960s, roads today still have the same asphalt, concrete and signs.
In fact, we are still designing pavements based on the American Association of State Highwa and Transportation Officials' road tests of the early 1960s. On the other hand, if you compare cars, computers, household products and medical facilities to those of the 1960s, you see a much greater change.