requirements to reduce idling emissions from new and in-use trucks beginning in 2008 55 pages english at its 20 october 2005 public hearing the air resources board the board or arb approved amendments to title 13 california code of regulations ccr sections 1956.8 2404 2424 2425 and 2485 and the incorporated california exhaust emission standards and test procedures for 2004 and subsequent model heavy-duty diesel engines. the approved amendments to the regulations and test procedures establish idling reduction requirements for new heavy-duty diesel engines and in-use sleeper berth equipped trucks and emission performance requirements for technologies used as alternatives to main engine idling. at the hearing the board adopted resolution 05-55 in which it approved the originally proposed amendments with several modifications. some of the modifications had been suggested by staff in a document entitled staffs suggested modifications to the original proposal that was distributed at the hearing and was attachment c to the resolution. other modifications were suggested by commenters and approved by the board during the hearing technologies utilizing electrical shore power or comparably clean emission technologies would be allowed as options to comply with the in-use idling regulations set forth in section 2485 of title 13 california code of regulations military tactical vehicles would be exempted from the proposed amendments to sections 1956.8 2404 2424 2425 of title 13 california code of regulations and the current exemption applicable to military tactical vehicles in section 2485 of title 13 california code of regulations would be clarified to also exempt operational modes such as training testing and deployment. the resolution and its attachment c are available at arbs internet web page for this rulemaking . the resolution directed the executive officer to incorporate the modifications into the proposed regulatory text with such other conforming modifications and technical amendments as may be appropriate and to make the modified text available for a supplemental comment period of at least 15 days. subsequent to the hearing the staff has identified a number of additional primarily technical modifications that are appropriate to make the amended regulations work as effectively as possible. the most significant post-hearing modifications are allowing the engine shutdown system to be overridden during exhaust emission control device regeneration or maintenance periods or if servicing or maintenance of the engine requires extended idling clarifying that the engine shutdown system requirements do not apply to emergency vehicles or to medium-duty vehicles clarifying in the test procedures portion of the rulemaking that for compliance with the optional nox idling standard the average nox emissions of each mode of the supplemental nox idling test procedure should not exceed the optional nox standard and modifying the definition of auxiliary power system aps in the atcm portion of the rulemaking to extend the availability of compliant apss as a compliance alternative to buses and other non-truck commercial vehicles