An approach is provided for estimating a quality of lane features of a roadway. The approach involves processing, by a computer vision system, an input image to detect the lane features of the roadway. The approach also involves determining respective confidence values associated with a plurality of regions of the input image used to detect the lane features. The respective confidence values represent a probability of predicting the lane features from each of the plurality of regions. The approach further involves performing a classification of the plurality of regions into a plurality of confidence levels based on the respective confidence values. The approach further involves determining the estimated quality of the lane features based on the classification of the plurality of regions.