The total travel time measure illustrates the performance of the expressway system in moving traffic. The County invests in the expressway system through its Capital Improvement Program. Generally, capital investments in the expressway are either designed to improve safety for users and/or improve carrying capacity. County Roads records the sum of all travel time on all eight county expressways (in both directions) and total number of vehicle trips per day on expressways.

The Pavement Condition measure is commonly used in the pavement maintenance profession to indicate the condition on roads for the purpose of usability, lifespan, programming capital investments, measuring the cost liability of the road system. County roads are graded using a standardized method consistently utilized throughout the Bay Area cities and counties. The data is recorded as Pavement Condition Index (PCI). The PCI numerical rating for the condition of the roads is on a scale from 0 to 100, where 0 is the worst possible condition and 100 is the best. PCI is used to develop budgets, identify preventive maintenance schedules and strategies, evaluate materials and designs, and provide a historical condition of the road.

The total travel time measure illustrates the performance of the expressway system in moving traffic. The County invests in the expressway system through its Capital Improvement Program. Generally, capital investments in the expressway are either designed to improve safety for users and/or improve carrying capacity. County Roads records the sum of all travel time on all eight county expressways (in both directions) and total number of vehicle trips per day on expressways.