Everyone should avoid answering call while driving for their own safety.
You just need to enable the Safe Drive mode in your application and your phone will not ring until you drive.
If someone calls you they will receive a SMS from you stating that you are driving and can't pick the phone.
There is a while list of callers, you can add contacts to this list and if someone from white list will call, you get notified.
Safe Drive application has been developed for on road safety of every individual.
Spread the words and encourage your near and dear ones to use this app for their own safety.
Standard SMS rates are applicable as per your plan.