Volume of Traffic on the Primary Road System
| 
                 Route  | 
            2003  | 
            
                 Rural/Municipal  | 
            
            Section length (miles) | Annual average daily traffic | 
                 
                    Vehicle classification distribution  | 
            Average daily vehicle miles | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 
                 Motorcylces  | 
            Cars, vans and pickups | Total trucks and buses | Single unit trucks  | 
            Combination trucks  | 
            All vehicles | Trucks and buses | |||||||||||
| Primary route section description  | 
        |||||||||||||||||
| 
                 Buses  | 
            
                 2Axles  | 
            
                 3Axles  | 
            4 or more axles | 4 or less axles | 
                 5Axles  | 
            6 or more axles | Multiple trailers | ||||||||||
| 48 | 15 Cass COUNTY | ||||||||||||||||
| 48 | INTERSECTION CO RD G66 | Rural | 1.006 | 1490 | 12 | 1330 | 148 | 6 | 45 | 22 | 4 | 18 | 48 | 3 | 3 | 1499 | 149 | 
| 48 | SOUTH LIMITS OF GRISWOLD | Rural | 3.750 | 1490 | 12 | 1330 | 148 | 6 | 45 | 22 | 4 | 18 | 48 | 3 | 3 | 5588 | 555 | 
| 48 | INTERSECTION IA 92 | Municipal | 0.459 | 2120 | 18 | 1957 | 145 | 5 | 44 | 21 | 4 | 17 | 47 | 3 | 3 | 973 | 67 | 
| 48 | NORTH LIMITS OF GRISWOLD | Municipal | 0.279 | 1900 | 16 | 1707 | 177 | 8 | 63 | 30 | 6 | 17 | 47 | 3 | 3 | 530 | 49 | 
| 48 | JUNCTION CO RD M56 | Rural | 2.422 | 1940 | 16 | 1743 | 181 | 8 | 65 | 31 | 6 | 18 | 48 | 3 | 3 | 4699 | 438 | 
| 48 | JUNCTION US 6 | Rural | 3.033 | 1350 | 11 | 1158 | 181 | 8 | 65 | 31 | 6 | 18 | 48 | 3 | 3 | 4095 | 549 | 
| ROUTE SUMMARY - RURAL | 10.211 | 1555 | 15881 | 1691 | |||||||||||||
| ROUTE SUMMARY - MUNICIPAL | 0.738 | 2037 | 1503 | 116 | |||||||||||||