Hi Marcus,
You can style the balloon using BallonStyle/text to suppress the
driving directions. Here's an example:
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="
http://www.opengis.net/kml/2.2">
<Document>
<name>BalloonStyle.kml</name>
<open>1</open>
<Style id="exampleBalloonStyle">
<BalloonStyle>
<text>$[description]</text>
</BalloonStyle>
</Style>
<Placemark>
<name>No Driving Directions</name>
<description>An example of BalloonStyle/text suppressing driving
directions</description>
<styleUrl>#exampleBalloonStyle</styleUrl>
<Point>
<coordinates>-122.370533,37.823842,0</coordinates>
</Point>
</Placemark>
</Document>
</kml>
BalloonStyle controls how a balloon displays. This tells Earth to only
display the description element and nothing else in the balloon.
You can get more information on BalloonStyle here:
http://code.google.com/apis/kml/documentation/kmlreference.html#BalloonStyle
Mano