Big Rigs Limited to Five Minutes Idling Per Hour

Big Rigs Limited to Five Minutes Idling Per Hour



October 2007

 Pennsylvania's 
extensive interstate highway system invites a heavy volume of truck travel 
through the state. With 260 truck stops, 47 public rest areas, and more 
than 13,000 truck parking spaces, there are many convenient areas for 
heavy-duty diesel vehicles to idle. 
On Tuesday, Pennsylvania introduced a new regulation to limit the amount 
of time a diesel-powered commercial vehicle can idle its engine. No more 
than five minutes will be allowed in any 60-minute period. 
The rule is aimed primarily at the 13,000 long-haul trucks that sit idling 
in Pennsylvania each day. Many drivers idle their vehicles during 
federally mandated rest periods to provide heating, cooling and power to 
their bunks and cabs. 
It also will affect other vehicles, such as delivery trucks, school buses, 
transit buses and motor coaches. 
Several exemptions are included in the proposed anti-idling measure, such 
as allowing a vehicle with a sleeper compartment to idle when the outside 
temperature is below 40 degrees or above 75 degrees Fahrenheit when 
stationary idle reduction technology is not available. This exemption 
expires May 1, 2010. 
A number of companies have developed commercial shore power products for 
the trucking industry to reduce idling. The companies offer the truck stop 
stationary infrastructure as well as the on-board tractor equipment to 
connect to shore power. For a comprehensive list from the U.S. 
Environmental Protection Agency, click here. 
Other exemptions include idling for active loading or unloading of 
passengers or property, operating work-related mechanical or electrical 
operations, and maintenance, repairs, or inspections for safety-related 
purposes. 
Passenger and school buses may idle for up to 15 minutes during a 
60-minute period to provide heating or cooling when passengers are on 
board. 
The regulation, developed by the Department of Environmental Protection 
after it was petitioned by the Clean Air Board of Central Pennsylvania 
must now be opened to public comment and be discussed in a public hearing 
before final consideration by the Environmental Quality Board. 
It then must be approved by the Independent Regulatory Review Commission, 
which reviews all proposed state regulations and, finally, the state 
attorney general. 
A study by Pennsylvania highway emissions consultant, Michael Baker Jr. 
Inc., estimated total statewide idling related to truck travel rest at 
more than 21 million annual hours. 
That total represents 96 percent of long-duration idling, when the engine 
of a still vehicle is left running for more than 15 minutes. 
If each of these trucks used alternative means to provide drivers with 
power during rest periods, fuel use would be cut by more than 20 million 
gallons a year. 
Estimates are that a tractor-trailer uses about one gallon of diesel fuel 
per hour when idling, which means that truck idling related to travel rest 
in Pennsylvania consumes 21 million gallons of diesel fuel each year. 
At diesel’s current statewide average cost of $3.19 per gallon, truckers 
are spending nearly $67 million each year on fuel to idle their vehicles 
during rest periods. 
Diesel powered vehicles emit nitrogen oxide, NOx, and volatile organic 
compounds, VOCs, both of which contribute to ground-level ozone, as well 
as fine particulate matter. These pollutants can cause or worsen breathing 
problems, especially in people with asthma, bronchitis, and emphysema. 
Once fully enacted in 2010, the regulation will reduce annual emissions of 
NOx by about 1,610 tons, VOCs by about 45 tons, and particulate matter by 
about 30 tons, according to the DEP. 
This rule will also help reduce carbon dioxide, the major greenhouse gas 
responsible for global warming, the DEP says. 
The Environmental Quality Board will accept public comment on this 
proposed regulation for 60 days following the regulation’s publication in 
the Pennsylvania Bulletin. It will also hold three public hearings on the 
proposal. 
Pennsylvania has awarded $1 million in grants to support the installation 
of alternative power sources to truckers, with more than another $1 
million in grants to small trucking firms to help them buy on-board 
alternative power units. 
Pennsylvania joins 14 other states, including Delaware, Maryland, New 
Jersey and New York in adopting similar anti-idling measures. 

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