missing_prior_notice_start_time

prior_notice_start_time value is required when prior_notice_start_day value is set in booking_rules.txt.

ERRORGTFSintegritydraftMobilityData canonical GTFS Schedule validator

Related

• Source: MobilityData canonical GTFS Schedule validator

Citations

[1] missing_prior_notice_start_time rule reference

Rule metadata

Code	missing_prior_notice_start_time
Standard	GTFS
Source	MobilityData canonical GTFS Schedule validator
Severity	ERROR
Category	integrity
Maturity	draft
Tags	mobilitydata, gtfs, integrity
Retrieved	2026-06-12
Reference	https://gtfs-validator.mobilitydata.org/rules.html#missing_prior_notice_start_time-rule