Login to Hawkeye and look for the truck that you are wanting to log the driver out off. This is done by entering the truck number in the search box as shown in the image
Now once the searched truck appears in the truck menu, click on the truck to bring up the truck on the map
Click on the cog on the top right corner of the truck popup
Choose Driver detail
In the driver detail window, Choose Logout driver from Unit
Choose "YES" on the logout confirmation