Enhanced vehicle operation

A system, comprising a computer including a processor and a memory, the memory storing instructions executable by the computer to:

• determine a confidence value that is a measurement of reliabiliy of roadway data collected by a sensor in a lane assist subsystem in a vehicle;
• upon determining that the confidence value of the roadway data is below a confidence value threshold, determine a section curvature for a section of a roadway, the section curvature including at least one section start point and at least one section end point, wherein the section curvature is determined based at least in part on a heading angle, the heading angle defining an angle between a projected line of travel of the vehicle and a line segment from a vehicle position to the section end point;
• replace a lane boundary distance determined by the roadway data collected for the lane assist subsystem for the section of the roadway by predicting a distance to a lane boundary based at least in part on the determined section curvature;
• and
• actuate one or more vehicle subsystems to operate in the section of the roadway based at least in part on the predicted distance to the lane boundary in the section of the roadway.