Transport

Stop Buying Such Huge Trucks – Streetsblog USA

Cities that are serious about achieving Vision Zero have to tackle large truck design.

Garbage trucks, fire trucks, commercial freight trucks, which comprise only four percent of vehicles on the streets, are responsible for almost twice that number of pedestrian fatalities and more than one in 10 bike fatalities, according to a new report from the Volpe Center, a research center at the U.S. Department of Transportation.

The disparity is much worse in major cities, which is why experts are urging urban policymakers to stop buying wide killing machines.

“Choosing vehicles with safer designs is a simple and proven step that any city can take to help stem the rising epidemic of traffic deaths on our streets,” Linda Bailey, executive director of the National Association of City Transportation Officials said in a statement.

The Volpe study offered these recommendations:

Make the vehicles smaller

San Francisco's smaller, more maneuverable fire truck. Photo: NACTO
San Francisco’s smaller, more maneuverable fire truck. Photo: NACTO

Smaller trucks stop faster. And they exert less force when they crash. But firetrucks in particular are just getting too big.

“Fire apparatus have grown in size to the point that emergency vehicles were recently exempted from federal truck weight limits,” the research team wrote. That is putting pressure on the nation’s bridges, many of which weren’t designed to handle fire vehicles weighing as much as 160,000 pounds.

The arms race on large vehicles is happening even as fire departments are becoming less diversified in their missions. Only about 5 percent of calls are related to building fires nationally, Volpe reported.

San Francisco recently ordered a firetruck that is 25 rather than 33 feet. It also has a 24-percent smaller turn radius, which makes it more maneuverable, potentially lowering response times. SFFD was able to do that without sacrificing any water pumping capacity, the Volpe report said.

Right now, there are few small firetrucks commercially available in the U.S. But the report suggested that if a handful of cities would band together, they could entice American manufacturers to consider smaller models.

Cab over design  

Cab over design means the driver sits over the wheel axel instead of way back behind the nose of the truck. This improves visibility by reducing blind spots.

You can see in this visualization that in a traditional truck, the entire bike lane might be invisible while waiting at an intersection.

But smaller, more maneuverable cab over designs have been successfully utilized in cities like Somerville, Mass. (below) to improve safety.

A garbage truck with cab over design. Photo: NACTO
A garbage truck with cab over design. Photo: NACTO

Additionally, cities can choose to lower the cab to further promote visibility and “help the driver to make eye contact and communicate intent with nearby pedestrians and cyclists.”

Trucks can be retrofitted with "peep" windows like this to improve visibility. Photo: NATCO
Trucks can be retrofitted with “peep” windows like this to improve visibility. Photo: NATCO

Add windows

The more windows in the cab, the better the visibility.

Many trucks have enormous blind spots. They make a big difference in how likely they are to avoid crashes.

“At 25 mph, the driver with improved direct vision may stop in about 90 feet, whereas the driver with indirect vision may not stop until 120 feet,” the authors wrote.

Transport for London, a global leader on safe vehicles has redesigned buses so the cab is practically a glass box.

Short of purchasing new trucks, cabs can be cheaply retrofitted peep windows along the sides of vehicles, as shown right, widening the field of vision.


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