Google Maps API - detect when crossing state lines and calculate distance travelled in each state

Question

I am using google maps api to calculate the number of miles my company\'s vehicles travel in each state over a period of time. For trips taken over the period, the user wil

Answer 1

Looking at the directions text in the panel, it looks like the text "Entering " appears in the steps that cross state boundaries.
http://www.geocodezip.com/v3_example_geo2.asp?addr1=New%20York,NY&addr2=Washington,%20DC&geocode=1&geocode=2

• Entering New Jersey
• Entering Delaware
• Entering Maryland
• Entering District of Columbia

(this is not documented, so might stop working)

You could also find the intersection of the Directions polyline with a set of state polygons.