---
kind: "section"
citation: "23 C.F.R. § 490.507"
title: "23"
number: "490.507"
heading: "National performance management measures for system performance."
url: "https://uscodex.org/cfr/23/490.507"
---

# §490.507. National performance management measures for system performance.


There are two performance measures to assess the performance of the Interstate System and the performance of the non-Interstate NHS for the purpose of carrying out the National Highway Performance Program (referred to collectively as the NHS Performance measures).

- (a) Two measures are used to assess reliability (referred to collectively as the Travel Time Reliability measures). They are:
  - (1) Percent of the person-miles traveled on the Interstate that are reliable (referred to as the Interstate Travel Time Reliability measure); and
  - (2) Percent of person-miles traveled on the non-Interstate NHS that are reliable (referred to as the Non-Interstate Travel Time Reliability measure).
- (b) [Reserved]

## Notes

### Amendments

[82 FR 6031, Jan. 18, 2017, as amended at 83 FR 24936, May 31, 2018; 88 FR 85392, Dec. 7, 2023; 90 FR 16466, Apr. 18, 2025]

### Source

Source: 82 FR 6042, Jan. 18, 2017, unless otherwise noted.

### Authority

Authority: 23 U.S.C. 134, 135, 148(i) and 150; 49 CFR 1.85.

### Source

Source: 81 FR 13913, Mar. 15, 2016, unless otherwise noted.

### Amendments

[82 FR 6031, Jan. 18, 2017, as amended at 83 FR 24936, May 31, 2018; 88 FR 85392, Dec. 7, 2023; 90 FR 16466, Apr. 18, 2025]