In many cases, your GIS map street names will not match the names in your crash record database. If the difference is significant, (i.e. ArcView can't see them as being similar names) then that location will not be geocodable. This is common when a state highway runs through a city. The city may use a local street name when entering crash data, and the map may use the highway name.
A very long street name exists in the database, but diagrams for locations on that street can not be generated, and sometimes the street itself is missing from high accident location lists.