If they are walking make sure they walk in groups. No child should be walking to school alone.
I must respectfully disagree. We should be teaching our children how to handle perilous situations, not lock them away to ensure their safety, nor drive them four blocks, when kids could definitely use the exercise and responsibility. Not only do Levi's statistics support this, these are skills they can put to use later in life. We do them no favors by sheltering them in this manner.
Woodbury is a very, very busy street, both before and after school. Teach your children to kick, scream, bite, run, whatever it takes to draw attention to an unwanted stranger. It would not go unnoticed. Teach them to never, under any circumstance, get in a car with a stranger, nor enter their house, no matter who they claim to be. Teach them every trick in the book to protect themselves, and then LET THEM BE KIDS.
You cannot account for, and protect them from, every possible dangerous scenario. Schools encourage children to walk to and from school, and there is even a designated week to try to get them to do so. Empower them with the knowledge they need and then let them walk, run, skip, bike, whatever.