History Highlights - The Highway Capacity Manual: The Transportation Research Board’s Instant Best Seller

For some 70 years, the Highway Capacity Manual (HCM) has presented tools for quickly evaluating and comparing the operational effects of alternative design scenarios, allowing analysists to screen a variety of approaches, and select a reasonable number before considering more costly measures. Learn about the history of the HCM--TRB's "Best Seller."

As part of the Centennial Celebration, TRB has initiated the History Highlights series that will regularly release stories that highlight the events and people that helped shape TRB during the last 100 years.

Check out the latest release in the TRB History Highlights series.