Automated vehicles will bring big highway capacity increases

As the transportation field grapples with the impending impacts of automated vehicles, one AV-related outcome seems clear: Highway capacity will dramatically expand. Because automatic braking systems react much faster than human drivers do, safe spacing on freeways can be reduced by about half. As a result, the current rule of thumb that a freeway lane can handle a flow of 2,000 vehicles per hour will be radically changed.

New Jersey DOT: no more roadway expansions

New Jersey’s newly appointed Department of Transportation Commissioner announced the agency will pursue a ‘fix-it-first’ mindset toward transportation spending. “The days of system expansion in New Jersey are long over, we don’t have the funds,” he said. “The focus is on the new status quo, paving, repairing deficient bridges, fixing potholes.”

One-way or two-way streets more efficient? It depends on what you measure

The debate over one-way versus two-way streets has been ongoing for more than half a century in American cities. Counter to prevailing engineering wisdom, a new study finds two-way streets may be more efficient, if one is measuring getting people to their destinations.

Linking Community Visioning and Highway Capacity Planning (Strategic Highway Research Program, 2012)

This report is intended to help transportation agency practitioners assess the possibilities of community visioning efforts, identify practical steps and activities when engaging in visioning, and establish links between vision outcomes and transportation planning and …

Gas consumption down to 2000 levels

Better vehicle fuel-efficiency and moderating demand for highway travel are combining to push gasoline consumption down to its lowest levels since 2000. Despite our growing population, Americans are using less gas.The downward trend both exacerbates the erosion of fuel taxes as a source of transportation funding, but at the same time suggests that agencies may be able to economize by rethinking capacity projects.