---
kind: "section"
citation: "23 C.F.R. § 1340.6"
title: "23"
number: "1340.6"
heading: "Assignment of observation times."
url: "https://uscodex.org/cfr/23/1340.6"
---

# §1340.6. Assignment of observation times.

- (a) **Daylight hours.** All daylight hours between 7 a.m. and 6 p.m. for all days of the week shall be eligible for inclusion in the sample.
- (b) **Random assignment.** Except as provided in [paragraph (c)](#c) of this section, the day-of the week and time-of-the-day shall be randomly assigned to observation sites.
- (c) **Grouping of observation sites in close geographic proximity.** Observations sites in close geographic proximity may be grouped to reduce data collection burdens if:
  - (1) The first assignment of an observation site within the group is randomly selected; and
  - (2) The assignment of other observations sites within the group is made in a manner that promotes administrative efficiency and timely completion of the survey.

## Notes

### Authority

Authority: 23 U.S.C. 402; delegation of authority at 49 CFR 1.50.

### Source

Source: 76 FR 18056, Apr. 1, 2011, unless otherwise noted.