Mapping Center Answer:

There are a couple of things to try:

1.  Use the word spacing option (I'm guessing that you're using Street Placement).  In ArcGIS 10, on the Maplex Placement Properties dialog, on the Label Position tab when you have Street Placement selected in the General section at the top, there is an Options button.  In there you can choose to spread the words along the street. 

2.  The other common cause of the situation you sent is that you have a layer in your map with a feature weight that is greater than 0.  Your yellow streets, for instance may have a feature weight.  If that is the case, you might find this Mapping Center Blog entry useful:  Using Feature Weight Rankings to avoid placing labels on major streets.