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Alaskan Transportation Winter 2002, Vol

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Alaskan Transportation Winter 2002, Vol “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” T E C H N O L O G Y F O R l a s k a n A Transpor tation Fall 2003 Local Technical Assistance Program Aug.— Oct. Volume 28, Number 3 Alaska’s New Laserlux Van to In this issue . • Alaska’s new Laserlux van be used in National Study. by Clint Adler & Jamie Brownwood Planning, Design, and Field Notes • Making Night Driving Safer • Plastic Mat Roads • Flowable Mortar Helps Bridge Approaches • Low-Volume Roads Conference report Ex-libris • New DOT books at the Keith B. Mather Library. Announcements AK DOT & PF’s Laserlux van—a new research tool for measuring retroreflectivity of pavement markings. • A List of Technologies & Innovations That FHWA This summer, Alaska Depart- • automatic distance measuring Believes Warrant Special ment of Transportation and Public instrumentation Attention, and Others Facility’s (AKDOT&PF) research • laptop computer with custom team received a Laserlux van software to operate a remov- Alaska Transportation from the Federal HighwayAd- able side-mounted scanning History ministration as a part of a study laser. • Of Steamships and Public to determine the life cycle of du- The laser and laptop work to- Health rable pavement marking materials, gether to continuously measure including methyl methacrylate, and record the retroreflectivity of Training and epoxy, preformed tapes, and ther- pavement striping at a rate of one Meetings Calendar moplastic. measurement every 4 feet while the • Many New Meetings The Laserlux van is a 1995 van is traveling up to 60 miles per Updates blue Chevrolet Beauville equipped hour. with: In this case, retroreflectivity • computer controlled data refers to the ability of the striping acquisition to reflect the light from a vehicle’s • real-time high speed headlights back to the driver. Road measurements striping with higher retroreflectiv- • GPS tracking system ity is more visible at night. The • video camera overlay continued 1 “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” Alaska’s new Laserlux van (continued) study will help the AKDOT&PF and partner states de- However, it is nice to have three people for efficient termine how long durable pavement marking materials calibration and handling of the equipment and to en- retain retroreflectivity over time. Participating states sure all the information is collected correctly. (Utah, Idaho, Oregon, Minnesota, Nebraska, Washing- The laser mounts on either side of the van so it can ton, Montana, North Dakota, and South Dakota) are safely read centerlines and fog lines. Mounting brack- using similar vans to collect four consecutive years of ets are located in front of the rear tires, and data cables retroreflectivity data in their jurisdictions. Ultimately, connect the laser to a docked lap top computer used the study will help provide striping that is more visible to operate the laser. The video camera provides a “la- at night. ser’s eye view” of the road on a small screen to assist How does it work? Researchers aim the scanning laser at the striping at a point 10 meters in front of the van. A sensor located inches above the laser detects the intensity of the ret- roreflected laser signal—processed and recorded by the laptop as retroreflectivity. The Laserlux system samples pavement markings at 1/3 geometry, read- ing a marking at a point 10 m in front of the Laserlux. One-third geometry is equivalent to a vehicle operator looking 30 meters down the highway. At this distance, the laser scans a width of 1.1 meters and provides retroreflectivity measurements anywhere within this width. Two people are necessary to collect data with the van—one to drive and one to operate the laptop. Front seat view screen enables driver or passenger a “laser eye view” to help driver with correct alignment. Jamie Brownwood, DOT engineering intern, demonstrates Laserlux graphical data logging software on the laptop docking station. A reciever hitch assembly on both sides of the van provides for easy set-up and adjustment of laser. 2 3 “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” the driver and laptop operator with alignment and data duty stations. Any change in seating or significant fuel recording. consumption will require recalibration. A standard- Researchers assure accuracy of measurement by re- ized calibration stripe is then placed 10 meters ahead peatedly calibrating the Laserlux system. To calibrate of the laser, and the operator adjusts the laser with the the automatic distance measuring instrument (DMI), laptop until the retroreflectivity readings match the the researchers drive and record the beginning and end stripe. The laserlux van is now ready for testing. of a precisely-measured straight section of road for For more information contact Alaska DOT&PF Re- 1000 feet. search staff by e-mail: To calibrate the laser positioning, a researcher aims [email protected] the laser and positions it exactly 14 cm above the road [email protected] surface while everyone is seated in the van in their Screen shot of Lazerlux software—the Windows 98 software enables researchers to measure retroreflectivity quickly and accurately. To see a related article on retroreflectivity seeTechnology for Alaskan transportation Winter 2002, Vol. 27 No. 4, Pavement Markings: Microscopic Evidence of Paint Curing Process Leading to Reduced Retroreflectiv- ity in Low-VOC Traffic Paints, and Making Nightime Driving Safer, in this issue. 2 3 “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” Planning, Design, and Field Notes Making Night Driving Safer By Jim Mearkle, P.E., Reprinted from Transportation Trailblazer, Colorado State University In the United States, almost one-half of all traf- It is important to replace signs and markings before fic fatalities occur during darkness. However, only they are too dim to be useful to the driver. Several one-fourth of all travel takes place during those same methods can be used to determine whether action is hours. This shows that driving at night is more dif- needed. ficult and more dangerous. Overhead lighting is one The most accurate method uses a retroreflectrom- way to make driving at night safer, but the annual cost eter. These devices measure the retroreflectivity of is too high to use it everywhere. Instead, retroreflec- signs or pavement markings. Unfortunately, they are tive materials are used. expensive. Signs and pavement markings are made to reflect Another option is nighttime visual inspections. light from the headlights back toward the driver’s These should be done at least yearly. Some guidelines eyes. This is called retroreflectivity. Retroreflective to follow include: materials use small glass beads or tiny prisms to re- • Use an SUV or pickup to do the inspection. Since flect light back toward its source. truck seats are farther back from the headlights Older drivers find retroreflectivity especially help- than sedan seats, the standards for retroreflectivity ful. Starting at age 20 or so, our night vision becomes will be based on large SUV’s. less acute with time. The average 33-year-old requires • Make sure your headlights are properly aimed. If about twice as much light to see at night as a 20-year- headlights are aimed too low or to the left, you old driver, and a 46-year-old person needs twice as may end up replacing good signs. If they are aimed much as a 33-year-old. So, as the population of the too high or to the right, you may keep a sign that United States gets older, retroreflective signs and needs to be replaced. pavement markings will become more important. • Use low beams. A sign that needs to be replaced may look okay when lit by high beams. Federal Standards are Coming • Be conservative. It’s better to replace a sign too Congress has mandated that the Federal Highway soon than to leave up a bad sign and have a crash Administration develop minimum retroreflectivity as a result. If the inspector is young, remember guidelines for signs and pavement markings. The ex- that signs and markings will not look as bright to act impact on local highway departments will not be older drivers. clear until the standards are finalized, but one estimate • Document your inspection process and findings. says eight to ten percent of signs on non-state roads This will help defend against lawsuits. could be below the minimum. Starting a sign inspec- tion program now will let you get a handle on the Good maintenance of traffic control devices will overall condition of your signs before the standards make your roads safer and reduce your risk of liability. are in place. This includes replacing signs and pavement markings as their retroreflectivity fades with time. Maintenance of Signs and Markings Visit the following website for more information on As the beads are worn off pavement markings by retroreflectivity: tires and snowplow blades, and weather and sunlight http://safety.fhwa.dot.gov/programs/retroref.htm degrade sign sheeting, their retroreflective properties (Reprinted with permission from Cornell Local degrade until they are no longer useful at night. This Roads Program, spring 2(103) can happen while the sign or stripe still looks good in the daylight. ) 4 5 “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” “Improving Alaska’s quality of transportation through technology application, training, and information exchange.” Planning, Design, and Field Notes Marking Curves Reduces Run-off Road Crashes One reason that accidents happen at night is that the visual information we use to drive is hard to see.
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