1. A method comprising: receiving image data depicting road signs from a plurality of vehicles; analyzing, by a processor, a detected lateral placement of the road signs and at least one characteristic of a collection of the image data; generating, by the processor, a model that associates values for the lateral placement of the road signs with values for the at least one characteristic; receiving a subsequent image including a road sign collected under a subsequent characteristic; identifying a plurality of road links in proximity to the road sign of the subsequent image; and determining, based on the model that associates values for the lateral placement of the road signs with values for the at least one characteristic, a selected road link from the plurality of road links based on a subsequent detected placement of the road sign and the subsequent characteristic.