Systems and methods for tread depth reader with modular sensor units

A method for estimating a tread depth of a tire supporting a vehicle, the method comprising:

• obtaining a plurality of images of the tire from a plurality of modular sensor units of a tread depth reader in response to the vehicle driving over the tread depth reader, a first modular sensor unit of the plurality of modular sensor units comprising a first light source and a first sensor, a second modular sensor unit of the plurality of modular sensor units comprising a second light source and a second sensor, a first color of the first light source differing from a second color of the second light source;
• and
• estimating the tread depth of the tire based at least in part on an analysis of the plurality of images.