What does the letter at the end of mix type designation indicate?

The letter at the end of a mix type designation indicates the level of traffic loading that the mix can handle. This classification helps engineers and construction managers select the appropriate asphalt mix based on anticipated traffic conditions. Different letters or symbols are assigned to indicate specific traffic levels, which is crucial for ensuring that the pavement can withstand the stresses exerted by vehicles over its lifespan. Choosing the right mix based on traffic loading helps maintain pavement durability, safety, and performance under different conditions. This system effectively communicates vital information for design and construction, ensuring that the pavement serves its intended purpose efficiently.