Index: roadmap.py
===================================================================
--- roadmap.py	(revision 7218)
+++ roadmap.py	(working copy)
@@ -151,6 +151,10 @@
         db = self.env.get_db_cnx()
         milestones = [milestone_to_hdf(self.env, db, req, m)
                       for m in Milestone.select(self.env, showall, db)]
+        milestone_filter = req.args.get('milestone')
+        if milestone_filter:
+            milestones = [m for m in milestones if m["name"] in milestone_filter.split("|")]
+
         req.hdf['roadmap.milestones'] = milestones        
 
         for idx, milestone in enumerate(milestones):