Code of Federal Regulations Title 40. Protection of Environment § 40.86.1802–01 Section numbering;  construction

(a) Section numbering. The model year of initial applicability is indicated by the section number. The two digits following the hyphen designate the first model year for which a section is applicable. The section continues to apply to subsequent model years unless a later model year section is adopted. Example:  Section 86.18xx–10 applies to model year 2010 and later vehicles. If a § 86.18xx–17 is promulgated, it would apply beginning with the 2017 model year;  § 86.18xx–10 would apply only to model years 2010 through 2016, except as specified in § 86.18xx–17.

(b) A section reference without a model year suffix refers to the section applicable for the appropriate model year.

(c) If a regulation in this subpart references a section that has been superseded or no longer exists, this should be understood as a reference to the same section for the appropriate model year. For example, if a regulation in this subpart refers to § 86.1845–01, it should be taken as a reference to § 86.1845–04 or any later version of § 86.1845 that applies for the appropriate model year. However, this does not apply if the reference to a superseded section specifically states that the older provision applies instead of any updated provisions from the section in effect for the current model year;  this occurs most often as part of the transition to new emission standards.