In the last couple of posts we looked at solutions for at-grade border vacuums, so now let's move on to sunken border vacuums, like highway and railroad ditches!

In the last couple of posts we looked at solutions for at-grade border vacuums, so now let's move on to sunken border vacuums, like highway and railroad ditches!

This time let's look at elevated corridors and how their impacts can be softened in Baltimore and other cities.