qgis - How to find dead-ends in road network using ArcGIS for Desktop or GRASS?

I'm trying to remove all the dead-end roads in a road dataset (lines) that are less than 100m long.

How do I identify roads that are dead-ends (no exit)?

The 100m part is easy.

I know how to use ArcGIS for Desktop proficiently and can use GRASS.

Answer

I had to do this just recently. Using ArcGIS 10:

If you only want to symbolise the dead ends you can just set up a Topology on the roads featureclass and set the rule "Must not have dangles". this will put a marker on every feature that has a dead end.

Alternatively, run the "Feature Vertices to Points" Tool (Located in Data Management Tools --> Features) and select "Dangle" as the point type. You can then use "Select by location" to pick up all lines that touch those dangle points.

Voila, all dead-end streets are selected.