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It will count when its a bumpy ride. A lot of people use the DriveBit App on their phone to get rid of them
You can also enter a driving record to get rid of them
https://help.fitbit.com/articles/en_US/Help_article/Can-I-delete-data
Sounds like DriveBit would be easier as it sounds like you make several trips
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Welcome to the Community @Woc and @WendyB thanks for stopping by.
As our friend here said, your tracker might pick up some steps while you are driving but you have two option to negate this extra information.
1. You can download the app DriveBit which will automatically recognize the steps and log them to your account.
2. You can manually log the activity "Driving" by doing the following from your Android Fitbit app:
1. Tap the exercise tile
2. Tap the stopwatch at the upper right corner
3. Enter your exercise and information
4. Tap Log it
I hope this helps, catch you later. 
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Community Moderator Alumni are previous members of the Moderation Team, which ensures conversations are friendly, factual, and on-topic. Moderators are here to answer questions, escalate bugs, and make sure your voice is heard by the larger Fitbit team. Learn more
Great to see you participating in the Community @Bonberd.
I think that it would be great for the Blaze to have a mode for not register information. I recommend taking a look at the Add "Driving Mode" Feature to avoid erroneous steps/floors request, vote for it and leave your comment.
In the meantime, you can follow the tips provided in my previous post or while driving you can put your pebble inside a pocket.
Catch you later. 
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