Federal regulators formally proposed to approve New Hampshire’s rollback of its vehicle inspection program on Thursday, triggering the start of a public comment period. The Environmental Protection Agency has previously signaled its intention to approve the request, which New Hampshire formally submitted in December. Last year’s state budget included a provision ending the mandate that all vehicles have an annual safety and emissions inspection. Since the end of inspections took effect, there have been two separate lawsuits filed seeking to reinstate the inspection program. An EPA spokesperson said the government intends to issue a final decision by the end of the year.