December 2017 Vol. 25, No. 4

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Drones offer advantages for bridge inspection
The use of drones—also known as unmanned aircraft systems—improves the quality of bridge inspections, reduces costs, and increases safety.

First-person vision goggles: The next evolution in bridge inspection?
First-person vision goggles provide live images during inspection and control of drone camera movement.

Self-propelled auto-flagger keeps workers out of traffic
Researchers developed a moving automated flagger assistance device that signals traffic at work zones.


Use of shingle-aggregate mix for gravel roads is growing in state
MnDOT research and recent projects indicate that mixing recycled asphalt shingles into the surface of a gravel road mitigates washboarding and dust.

New guide offers cost-effective methods for slope stabilization
Researchers determined effective methods for stabilizing slopes along locally maintained roads and created a guide recommending slope stabilization methods for common site types.

New synthesis: alternative deicers
A new Transportation Research Synthesis summarizes non-chloride-based deicers available on the market, including acetate, formate, glycol, and succinate-based deicing products.

More from the LRRB and MnDOT
Recent materials on topics such as chip seals and bicycle fatalities.


Math proves the savings in pavement preservation strategies
The EDC-4 pavement preservation initiative helps agencies pull together information for their networks and identify strategies that take whole-life costs into consideration.

Using recycled concrete aggregate in new concrete pavement mixes can save money
Researchers developed guidelines for successful use of recycled aggregate in new concrete pavements.


Farewell, Jim Grothaus!
Jim Grothaus, long-time Minnesota LTAP director, has accepted a new position as technical resource promotion engineer with Hancock Concrete.

APWA—Minnesota wins national honors
The American Public Works Association Minnesota chapter received eight awards at the 2017 APWA Public Works Conference in Orlando.


ADA transition plans for local agencies: training and online guide available
The Minnesota Local Road Research Board is sponsoring a series of training courses on the federal Americans with Disabilities Act.

New from Clear Roads: plow operator and supervisor training modules
This Clear Roads project developed a comprehensive snowplow operator and supervisor training program that provides flexibility for states to modify or update the content as needed.

Minnesota LTAP offers leadership course
Minnesota LTAP will present a new course—Transitioning into Leadership: Essential Skills for New Supervisors—on April 25 in Lakeville.

Curb enthusiasm
Curb slope requirements are based on ADA standards. Watch a short video from the City of Brooklyn Park about curb slopes and test your knowledge.


The Shelf
Recent publications from various sources.

Report offers snow removal performance metrics
Clear Roads investigators surveyed transportation agencies to better understand snow removal performance metrics in use and under consideration.