At the top of this Trulia page you can enter Dallas TX then select "local info" from the drop down menu or to the top right. Click on "crime" & you will see an interactive map with police reported incidents shown on a heatmap. You can zero in on neighborhoods & streets. The incidents are listed below the map. Hope this helps!
The answer to that question is very subjective. "Safe" means something different to everyone. I would suggest looking into the crime reports for the neighborhood, and zip code. I would be happy to look into that for you
Kevin D. Brown