Jackson Elementary School along Harvey Drive in McAllen is the backdrop for this week TMs Streets of Speed.
Robert Sustaita called on the Speedzapper to help spread his anti-speed message to drivers.
Sustaita said he spent the last four years walking his sister to and from school to protect her from out-of-control drivers.
The Speedzapper came armed with radar to see if the problem still exists.
Click on the video link to see what is found and who gets zapped!