Solved! Go to Solution.
You need to use the Trigger "Lead IS Created" to do this. The green filter is what happened in the PAST or an existing attribute.
So it would be what Kenny said plus
Lead Is Created
Filter = Most Recent Lead Source IS "Road Map" to ensure that only new leads with this value get pushed OR leads where this value Changed to "Road Map" get pushed.
The visual doesn't do it justice, but it's like running two OR statements that operate independently.