The short answer

Start with the pattern. A planned control joint may open and close as concrete moves, while a random crack can reflect shrinkage, settlement, tree roots, drainage, freeze-thaw, or a weak subgrade. The visible line should be recorded with width, vertical offset, water, slope, and nearby edges before choosing a sealant or replacement.

Use a driveway log

Detail Record Why it matters
Straightness and location Joint, edge, corner, or random field Pattern adds context.
Width and offset Same scale and lighting Movement can matter more than width.
Water Ponding, runoff, or erosion Drainage may be the root problem.
Adjacent slabs Tilt, heave, or trip edge Settlement can extend beyond one line.
Change over time Photos after rain and winter A single visit can miss movement.

Keep downspouts and driveway drainage from directing water under the slab. Do not grind or widen a crack before documenting it, and do not operate heavy equipment near a settled edge. If the driveway supports a retaining wall, garage threshold, or steep slope, the consequence of movement is higher.

Ask for a specific scope

Separate crack sealing, joint replacement, slab lifting, saw-cut removal, base repair, drainage, and full replacement. “Resurface” can improve appearance while leaving the moving slab unchanged. A good estimate states the suspected cause and what observation would change the recommendation.

Limits

This guide cannot classify a driveway crack as structural or safe. Significant displacement, erosion, or a trip hazard needs qualified evaluation.