Built for Shrewsbury's ground
The north end of the city runs toward Deer Creek, and ground near a creek stays wetter than the upland behind it. County soils formed largely in loess over clay, and the soil survey lists low strength and frost action as limits for local roads. Get water out of the base and a freeze-thaw winter has much less to work with.
The part of the job you can see is the last two inches. Ask what is underneath, how it will be compacted, and which way the finished surface drains.
Compacted asphaltTypically 2 to 3 in. for a car drive
Stone baseTypically 4 to 8 in., compacted
Drive on itUsually 2 to 3 days, longer in heat
First sealcoatTypically 6 to 12 months after paving
Typical ranges. Your Shrewsbury estimate is sized to the soil, the traffic and the drainage on your property.