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.
When a corridor diagram is created for a street which is an alias to another street, not all the crashes will be shown. The crashes included may also not include those that occured on end-point cross streets if they are aliases as well.