Compare a part between two dates
Pick a part and two dates. Every section whose wording changed in between is listed with a link to the exact diff. Built for the deposition question "has this rule changed since the crash?"
Part 325 — Compliance with Interstate Motor Carrier Noise Emission Standards
Between Sept. 30, 2011 and today (current through Oct. 22, 2026): 7 amended, 0 added, 0 removed, 21 unchanged.
Sept. 30, 2011 falls before day-level history begins (Jan. 1, 2017). It is read from the annual CFR edition in force that day (revised as of October 1), so an amendment that took effect earlier in that edition year is counted as already in place. Federal Register citations on each section give exact effective dates.
- Amended§ 325.1 Scope of the rules in this part.View diffChanged Oct. 1, 2013
- Amended§ 325.3 [Reserved]View diffChanged Sept. 30, 2019
- Amended§ 325.7 Allowable noise levels.View diffChanged 2 times: Oct. 1, 2013; Jan. 1, 2017
- Amended§ 325.13 Inspection and examination of motor vehicles.View diffChanged 2 times: Oct. 1, 2013; Nov. 17, 2023
- Amended§ 325.79 Application of correction factors.View diffChanged Jan. 1, 2017
- Amended§ 325.91 Exhaust systems.View diffChanged Oct. 1, 2011
- Amended§ 325.93 Tires.View diffChanged Jan. 1, 2017
Unchanged (21)
- § 325.5 Definitions.
- § 325.9 Measurement tolerances.
- § 325.11 Issuance, amendment, and revocation of the rules in this part.
- § 325.21 Scope of the rules in this subpart.
- § 325.23 Type of measurement systems which may be used.
- § 325.25 Calibration of measurement systems.
- § 325.27 Use of a windscreen.
- § 325.31 Scope of the rules in this subpart.
- § 325.33 Site characteristics; highway operations.
- § 325.35 Ambient conditions; highway operations.
- § 325.37 Location and operation of sound level measurement system; highway operations.
- § 325.39 Measurement procedure; highway operations.
- § 325.51 Scope of the rules in this subpart.
- § 325.53 Site characteristics; stationary test.
- § 325.55 Ambient conditions; stationary test.
- § 325.57 Location and operation of sound level measurement systems; stationary test.
- § 325.59 Measurement procedure; stationary test.
- § 325.71 Scope of the rules in this subpart.
- § 325.73 Microphone distance correction factors. 1
- § 325.75 Ground surface correction factors. 1
- § 325.77 Computation of open site requirements—nonstandard sites.