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- Safe Routes to School (SRTS) program
- SAFETEA-LU - Federal Transportation Reauthorization Funding Summary (January 2010)
- Safety, Analysis, Visualization and Exploration Resource (SAVER)
- Safety apparel - high visibility
- Safety - Comprehensive Highway Safety Plan tracking tool
- Safety programs
- Sales - land, buildings
- Sales - used equipment and vehicle auctions
- Salvage information
- Scenic byways of Iowa
- School buses, when to stop or pass
- Scrapping a vehicle
- Seat belt exemptions
- Seat belt survey
- Selling your vehicle
- Service club signs
- Signs, advertising
- Signs - advertising rules (PDF)
- Signs - Manual on Uniform Traffic Control Devices
- Signs, request for signs
- Signs - tourist
- Signs, traffic signs
- Signs Truss Standards
- Small business development contracts
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- Snowmobiles, legal operation of
- Specifications for highway and bridge construction
- Speed camera enforecement (PDFs)
- Speed-change lanes
- Spills on highway - contact your district office
- Standard bridge plans
- Standard culvert plans
- Standard drawings
- Standard road plans
- Standard specifications
- State of Iowa
- State parks and institutional roads
- State Transportation Plan Update - Iowa in Motion
- Statewide Transportation Improvement Program
- Statewide Urban Standard Specifications (SUDAS)
- Statistics - motor vehicles
- Stock catalog, inventory
- Strategic Highway Safety Plan, Iowa
- Strategic Plan, Iowa Department of Transportation (PDF)
- Street Financial Report
- Structure Inventory and Inspection Management System (SIIMS)
- Style Manual, Iowa Department of Transportation's
- Supplemental Specifications
- System Classification for Planning Map
- Systems Operations Bureau
- Systems Planning, Office of
