Evaluating the capacity and LOS of a roadway probably seems like a daunting task. In reality, the calculations are really quite simple. The Theory and Concept links that are located below should help you navigate through the process with ease. Topics followed by the characters '[d]' include an Excel demonstration.

Basic Freeway Section and Ideal Conditions
Free-Flow Speed and Flow Rate
Level of Service Criteria
Determining Flow Rate [d]
Peak Hour Factor
Heavy Vehicle Adjustment Factor [d]
Free-Flow Speed Adjustment [d]
Determining LOS and Density [d]
Applications [d]