It is the same story at popular crossings all along the border.

Similar operations had been started at other major border crossings.

This security is great for international travel especially at border crossings.

Deaths at crossings were up 11 percent last year, to 369, according to federal figures.

More than 400 people a year die in collisions at crossings.

In all, nearly 900 people have died at crossings that lack lights or gates since 2000.

A particular problem exists at crossings where there is a central reservation.

Last year there were 422 deaths at crossings, down one-third from five years earlier.

This may result in non-monotonic behavior at major crossings, such as from 01111 to 10000.

The safety improvements at crossings can be done using combination of techniques.