"If analysis is going to be imposed on the rule-making process, we want higher values for injury and for fatalities," said Robert Weissman, president of Public Citizen, which pushed the Transportation Department to reconsider the roof-strength regulation.
Complicating the issue is the fact that dozens of models of the heaviest S.U.V.'s and pickup trucks, those 6,000 pounds or more, are exempt from any roof strength regulations at all because the rules were developed long before the truck boom.
Following Ronald Reagan's dictum, "Government is not the solution to the problem, it is the problem", banks were allowed to unite under one roof activities that regulation had previously required to be divided between separate firms and banks.
In particular, the actual German guidelines have been widely adopted as a reference basis for green roof design and regulation worldwide, because of its exhaustiveness and proven building- and landscaping tradition.
The economic effects of adjoining vegetation and green roofs on climate regulation provided energy savings of up to almost $250/tree/year, while the air quality regulation was valued between $0.12 and $0.6/m2 tree cover/year.
Contrary to all safety regulations, the roof of the reactor complex had been constructed with bitumen, which proved a highly flammable agent.
Under Housing Authority regulations, the single roof covering housing projects' adjoining buildings is off limits, but under the city's fire code, doors to the roof must remain unlocked.
Despite being more prone to rollovers than cars, large vans, as well as large S.U.V.'s, are not subject to many car regulations, including minimum roof strength requirements.
Ms. Sullivan, who is a principal in a private equity firm specializing in health-care investments, started planning the rooftop addition in 2005, but getting city approvals took more than a year, and she was disappointed to learn that even though she had the rights to nearly 1,400 square feet of roof space, zoning and landmark regulations limited her addition to 270 square feet.
Last year, a spate of collapses at outdoor concerts led to calls for more regulation of temporary stages, roofs and lighting rigs.
