Access Management Toolkit: 
Answers to frequently asked questions

All files below are in pdf format. To read pdf files, you may need to download the free Adobe Acrobat reader.

Access Management Concepts 

1 Driveway-related crashes (54k pdf)

2 Driveway spacing (21k pdf)

3 Driveway density and driveway consolidation (12k pdf)

4 Intersection spacing and traffic signal spacing (10k pdf)

5 Functional areas of intersections (15k pdf)

6 Conflict points (16k pdf)

7 Speed differential between turning vehicles and through traffic  (17k pdf)

8 Benefits of access management (21k pdf)

9 Economic impacts of access management (18k pdf)

10 Access management and pedestrian safety (181k pdf)

Common Access Management Treatments

11 Driveway grade (44k pdf)

12 Driveway width (47k pdf)

13 Clearing driveways away from corners (103k pdf)

14 Shared/joint driveways and/or cross access (69k pdf)

15 Continuous two-way left-turn lanes (59k pdf)

16 Three-lane roadways with two-way left-turn lanes (51k pdf)

17 Raised medians at intersections (83k pdf)

18 Continuous raised median (63k pdf)

19 Comparison of raised median and two-way left-turn lanes (69k pdf)

20 Frontage and backage roads (70k pdf)

21 Dedicated left and right turning lanes (54k pdf)

22 Driveway turn radius (14k pdf)

23 Internal circulation in land developments (24k pdf)

Other Corridor Design Considerations

24 Sight distance (66k pdf)

25 Incorporating aesthetics into access management (96k pdf)

26 Clear zones, utility placement, and lighting (88k pdf)


Learn more about the Iowa Access Management project.



CTRE is an Iowa State University center.

Address: 2711 S. Loop Drive, Suite 4700, Ames, IA 50010-8664

Phone: 515-294-8103
FAX: 515-294-0467

CTRE Communications: Marcia Brink
CTRE Webmaster: Michele Regenold


Iowa State University--Becoming the Best