Quick hack to get the fastest route from/to home to/from work, and post it to mqtt so that Home Assistant/Openhab can pick it up. I had issues getting the paho mqtt library working for some reason, so I just resorted to using the mosquitto_pub client.

configuration.yaml

  - platform: mqtt
    state_topic: "traffic/worktohome/fastest"
    name: "Traffic work to home"
    unit_of_measurement: "minutes"
    state_format: "json:minutes"
  - platform: mqtt
    state_topic: "traffic/hometowork/fastest"
    name: "Traffic home to work"
    unit_of_measurement: "minutes"
    state_format: "json:minutes"

googletraffctomqtt.py

import googlemaps
import json
from datetime import datetime
from collections import OrderedDict


API_KEY = 'API KEY from google traffic api'
home = 'home street address'
work = 'work street address'


def getRoute(fromAddr, toAddr):
    gmaps = googlemaps.Client(key=API_KEY)
    now = datetime.now()
    results = OrderedDict()
    directions_result = gmaps.directions(fromAddr,
                                         toAddr,
                                         mode="driving",
                                         departure_time=now,
                                         alternatives=True)
    results['description'] = "{fromAddr} to {toAddr}".format(fromAddr=fromAddr, toAddr=toAddr)
    results['fastest'] = {'time': None, 'text': None, 'name': None}
    for route in directions_result:
        # print json.dumps(directions_result, indent=4)
        # print route['summary']
        total_distance = 0.0
        total_time = 0.0
        results[route['summary']] = OrderedDict(legs=[])
        for leg in route['legs']:
            # print leg['distance']
            total_distance += leg['distance']['value']
            total_time += leg['duration']['value']
            for step in leg['steps']:
                results[route['summary']]['legs'].append("{distance} {duration} {desc}".format(
                    distance=step['distance']['text'],
                    duration=step['duration']['text'],
                    desc=step['html_instructions']
                ))
                # print "\t", step['distance']['text'], step['duration']['text'], step['html_instructions']

        results[route['summary']]['total_miles'] = (total_distance * 0.00062137)
        results[route['summary']]['total_minutes'] = (total_time / 60)
        if not results['fastest']['time'] or results['fastest']['time'] > total_time:
            # new fastest route
            results['fastest'].update(time=total_time,
                                      name=route['summary'],
                                      text="{minutes:.2f} min via {name}".format(minutes=results[route['summary']]['total_minutes'], name=route['summary']))
        # print "Total Distance: %.2f miles" % (total_distance * 0.00062137)
        # print "Total Duration: %.2f minutes" % (total_time / 60)
        # print ""
    return results

res = {
    'worktohome': getRoute(work, home),
    'hometowork': getRoute(home, work)
}
print json.dumps(res, indent=4)

from subprocess import check_output
msgs = []
for x in res:
    res[x]['fastest']['minutes'] = res[x]['fastest']['time'] / 60
    print "creating msg %s: %r" % (x, res[x]['fastest'])
    print "sending message to mqtt: %s" % json.dumps(res[x]['fastest'])
    print check_output(['/usr/bin/mosquitto_pub',
                        '-d',
                        '-h', 'mqtt',
                        '-p', '8884',
                        '-u', 'USERNAME',
                        '-P', 'PASSWORD',
                        '--cafile', '/root/cacert.pem',
                        '-q', '1',
                        '-t', 'traffic/%s/fastest' % x,
                        '-r',
                        '-m', json.dumps(res[x]['fastest'])
                        ])