Heavy lorries and buses have not been allowed on some I-95 bridges for two years.
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It is also making small but significant progress as a fuel for lorries and buses.
In the short run, that might restrict natural-gas use to vehicles such as lorries and buses, where space is at less of a premium (and which already run on a different fuel from most cars).
Lorries and school buses full of demonstrators clatter past, heading for one rally or another.
The low emission zone - which begins in February 2008 - aims to deter the most polluting vehicles from being driven in central London by imposing charges on lorries, coaches and buses that fail to meet low emission standards.
It came to an end in 2003, when the Cob was bought by the Welsh Government, and was widened to make it easier for buses and lorries to pass each other.
Built in the 1970s, Derby's inner ring road is used by almost 60, 000 vehicles on an average weekday and at peak times more than 4, 000 cars, buses and lorries use the section of road every hour.
Dhaka's Daily Star newspaper reports that the group hired at least 3, 000 vehicles, including buses, lorries and minibuses to bring demonstrators into the capital, while others travelled there by train.
Dhaka's Daily Star newspaper reported that the group had hired at least 3, 000 vehicles, including buses, lorries and minibuses, to bring demonstrators into the capital, while others travelled there by train.
There are no plans for pollution-charging to cover private cars (only platitudinous incentives for electric cars), which, though individually cleaner than buses and lorries, are more plentiful and produce roughly similar amounts of muck in total.
As well as two fuel-cell systems for vehicles (one for cars, another for buses and lorries), there are separate systems for large and small generators fridge-sized units running on natural gas to provide electricity for a building that is not attached to the grid.
In Yerevan, Armenia, where I was last May, I noticed buses and lorries resplendent with rusty-looking cylinders of gas as their fuel supply, which is more cheaply obtained than liquid fuels, but I emphasise that it is petroleum gas (mainly propane and butane) that is used there and not biogas.
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