How to represent speed range values in a simple and efficient way?

I have a task to create a form for administrator of Google Maps Live Traffic Congestion feature. Here's what needs to be input in the form :

• Congestion level name and color for the map (green,yellow,red)
• Road type
• Speed range value

I attached the task in details as well as the things I did so far. I would appreciate some feedback on overall form and advice on how to represent speed values since they can't overlap.