TTI has developed procedures for analyzing one-way and two-way frontage roads. Frontage roads operate similarly to arterials since they are corridors with signalized or unsignalized intersections. However, frontage roads also have ramp connections to and from freeways and driveways on only one side. TTI used HCM’s urban and suburban arterial LOS analysis as a base model for analyzing frontage roads and made modifications to the methodology to account for ramp interactions and driveways to develop a seven-step process for evaluating frontage road operations. The steps can be repeated to analyze both sides of a two-way frontage road. It is recommended to follow the seven-step process, substituting the latest HCM methodologies where relevant. See

Figure 9-2

for a flowchart that provides an overview of TTI’s seven-step process for frontage road analysis. A guide with

examples

is included in

Appendix J, Section 1 – TTI Frontage Road Analysis Steps and Examples

.