Standard Road Plans

Updated for the April 2021 letting. For files prior to this letting, refer to the Electronic Reference Library (ERL)

The standard road plans contained in this manual (commonly referred to as the "Red Book") have been developed to show standardized design features, construction methods and approved materials to be used in design plans for interstate, primary and secondary road construction in the state of Iowa. These standard road plans are not intended to provide solutions to design problems. Where specific design problems require special solutions, the standard road plans may be modified. Refer to Section 1E-5 of the Design Manual for guidelines for modifying Standard Road Plans.

Standard Road Plan Items English
Index Sheets E-Index
Recently published E-Recent
Renumbered Standard Road Plans and Design Details PDF file

Standard Road Plan Items October update April update
Revision packet October April

  Book Sections
BA Barriers
BR Bridge Approach Pavement
DR Drainage
EC Erosion Control
EW Earthwork
LI Lighting
LS Local Systems
MI Miscellaneous
PM Pavement Markings
PR Pavement Rehabilitation
PV Pavement
SI Signs
SW Sanitary and Storm Sewer
TC Traffic Control
TS Traffic Signals
WM Water Main