Guidelines for speed limits in Michigan work zones were revised in 2006. Motorists are required to reduce their speed to 45 mph in any work zone where workers are present. If no workers are present, motorists should maintain the posted speed limit. More information on this change is available in the Safety Programs FAQ.
Another aspect of this program is nighttime construction. You may not see anyone working in these areas until the sun and traffic volumes go down. On other projects, contractors are not allowed to work during busy hours. All highway construction work is normally suspended during holidays. Other factors such as inspection activities, soil conditions, weather factors and production schedule may also give the appearance of minimal activity, but greatly impact the construction of the project.
- Political candidates are responsible for obtaining approval from the adjacent property owner to place the signs.
- Signs must be removed within 10 days following an election.
- Signs must be more than 30 feet from the edge of the roadway (white line) for highways that do not have barrier-type curbs. For highways with barrier curbs, the signs must be more than three feet from the back of the curb.
- Signs are not permitted within areas used for clear vision at intersections or commercial driveways, so they will not interfere with the sight distance of a driver. No signs may be placed within the limited access rights-of-way.
- Any illegally placed signs will be removed. Signs removed by MDOT crews will be kept for seven days at a local MDOT office or maintenance garage, then discarded.
For information on other types of highway signs, see Highway Advertising Signs and Logo Signs & Tourist Oriented Signs
The symbols are ‘targets’ an aerial photograph; there is no meaning to the different shapes or configurations of the markings.
A survey crew is dispatched to survey the location of these targets and assign coordinates to each.
When the survey is completed, the spatial relationship between each of the targets is known, such as the distance between them and the difference in elevation. This information is provided to an MDOT “photogrammetrist,” an aerial mapper.
The photogrammetrist loads two aerial photos into a machine called a “stereoplotter.” Each pair of photos overlap each other so that each inch of roadway is photographed from two positions to create a 3D view. (Similar to toy stereo viewmasters where two photos are inserted in the viewmaster to make a 3D picture.)
When the photogrammetrist views the targets in the 3D view, he can assign the coordinates given to him by the surveyor. Once this is complete, the relationship between the ground distances and the distances on the photo are known.
Once the relationship between the ground distances and the distances on the photo are known, any distance measured on the photo can be equated to its true distance on the ground, and a true scale map can be made of everything that can be seen on the photo.
Who do I contact for general questions about Michigan’s Heritage Route Program’s nomination and designation process? How can I obtain the application forms for nominating Heritage Routes?
For general questions about the Heritage Route Program and the application process call Peter Hanses, Heritage Route Program Manager (517) 335-2934. You can also visit the Heritage Route Website by following the link below.
Who can I talk to about trucks speeding or tailgating, or other truck safety issues?
Please contact the MICHIGAN CENTER for TRUCK SAFETY at) 800-682-4682, FAX 517-321-0864.
For more on speed limits, visit the Office of Highway Safety Planning (OHSP).
Workzone Speed Limits
Why were the guidelines for work zone speed limits changed?
Since 1988, changes in the Michigan Vehicle Code have affected work zone speed limits in Michigan, resulting in different speed limit criteria being applied statewide. These inconsistencies have made enforcement difficult as motorists may see speed limits reduced 10 mph in one work zone, and then see 25 mph reductions in another work zone.