Sometimes devotees chant while they are driving. It’s a bad habit. Devotees who are driving, they always ask, “Can I chant my japa while I am driving?” I tell them, “You can certainly chant Hare Kṛṣṇa while you’re driving, but you can’t count it as your japa.” So many distractions! One is actually supposed to make progress in chanting the Holy Name.
MKV, Vol 8- Pg 15, Our Progress in Life is Gauged by Our Chanting- May 01, 2001-Moscow