With ActivityTask your smartphone can detect when you are in a vehicle on foot on bike still or if the phone is tilting. See the video tutorial to understand how it works.
Note1: If it doesn't work for you check the location settings. Change "device only" to "high accuracy" or "battery saving".
Note2: Be sure to have installed Google Play Services 4.4
Note3: To start/stop the process you have to create a Tasker task with the plug action

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It requires:
Locale or Tasker or AutoMagic or Easy Profiles intalled

Tasker variables:
%atactivity: The activity detected
%atconf: The confidence level for the detected activity.