3D Milling

Three-dimensional milling is a combination of 3D design models, automated machine control and total station positioning that allows milling machines to automatically adjust elevation and slope based on the position of the milling machine on the 3D model.

3D Milling Benefits ODOT and Contractors

3D milling is an accurate and efficient method of correcting cross slope or shifting roadway alignment. It improves grade accuracies to within 0.02 ft. and allows the Oregon Department of Transportation and contractors to construct the correct depth and slope at any location on the roadway.

3D milling also resolves concerns that currently exist with variable depth leveling mix, such as:

• Poor asphalt compaction;
• Delays and errors related to project staging and staking;
• Grade constraint limitations; and
• Incomplete as-built records.

Use of 3D milling technology accurately and efficiently addresses concerns such as cross-slope gradient and roadway alignment. If a project involves asphalt removal and replacement with PCC, 3D milling can accurately prepare the base, providing a uniform surface for PCC placement.

These enhancements also allow contractors and inspectors to analyze the roadway grade quickly from anywhere on the project.

Implementation of 3D milling practices is underway and will be used on select ODOT construction projects.