TIER is now Dott! TIER and Dott have joined forces to offer you smoother rides, in more locations, and with even better passes. From now on, all TIER vehicles are ready to ride on the Dott app instead. Download the Dott app today to get riding! Turn on screen reader support To enable screen reader support, press ⌘+Option+Z To learn about keyboard shortcuts, press ⌘slashWilbert Baan has joined the document.