This workflow calculates the route from the current location, a contact from your address book or a specified location to either the current location, a contact from your address book or a specified location. The scripts are written in python and use the pre-installed objective-c bridge pyobjc to search the address book and determine the current location with CoreLocation. Because of this, OS X will display messages that ask for the permission to use CoreLocation and AddressBook.
The scripts use the shipped python version and the nice alfred module by nikipore (included). Because of the usage of OS X APIs there are requirements for the OS X version. I developed and tested the workflow on 10.8.4 and 10.9.1, but perhaps older versions are also working (feedback?).
You could either download the alfredworkflow file from Packal or clone the repository to your Alfred workflow folder:
git clone https://github.com/abyth/google-maps-route-workflow.git\
~/Library/Application\ Support/Alfred\ 2/Alfred.alfredpreferences/workflows/Simply type "route" followed by the first or last name of a contact or a custom location and choose the right one from the list. You can also specify two addresses in the same manner to calculate a route between the two. If your custom address or the contact name include spaces, you'll need to put quotes around it.