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Reflective Materials on Bicycle Helmets
10/11/2010 10:44:02 AM

Reflective Materials on Bicycle Helmets


Summary: We believe that reflective materials on helmets can increase night time conspicuity, but tests conducted by CPSC failed to confirm that. Reflectors can never replace active lights.

BHSI has been a long-time supporter of the use of reflective materials on helmets to increase night time conspicuity.

CPSC Standard
In 1995 BHSI worked with 3M to organize a night-time demonstration for CPSC staff of various reflective tapes that could be used on helmets. We were asking CPSC to add a requirement for a retro-reflective surface area to make helmets more visible under night conditions. After that demonstration the agency undertook its own more scientific testing and determined that adding reflective surface did not aid motorists in recognizing a bicycle rider earlier. In fact their results showed that the reflective tape appeared to lengthen the time for recognition of a cyclist. It is possible that the reflective tape confused the driver about what they were approaching, since it would not immediately carry the signature of a cyclist or a helmet, but just appear as a bright something-or-other point ahead. So the bright spot would catch a driver's eye, but not necessarily identify the source. That would, of course, change if every helmet had similar reflective surfaces, and driver identification would be quicker. In any event, CPSC decided not to add a reflective requirement to their standard.

Here is the standard we were proposing. The early drafts were based on a hot 3M material, but the reflectivity requirement had to be reduced when it developed that none of their competitors had a material that bright, and the standard could not bless one manufacturer's product.

Add tape?
Should you add tape to your helmet? Maybe. We do. But please read this page on stickers first for the ins and outs of putting sticky stuff on your helmet. The solvent in the adhesive can attack helmet shells and weaken them unless you are sure of the compatibility of shell and tape. The best tapes are not available in normal consumer channels, because they would be too expensive. The adhesives used by 3M for consumer-grade Scotchlite tape are apparently compatible with many helmet shells, but not necessarily all. 3M also has some really hot tape available in commercial channels and at some Web sites for marking tractor trailers and other purposes. Other manufacturers have similar products, but we don't know about their adhesives.

Limitations
Reflective trim can't make you safe at night. At a minimum you need active lights and more. Any reflective surface on a helmet is high above the street level where car lights concentrate most of their beam, and if there is no light shining on the reflective surface to bounce back at the driver there is no advantage at all to reflectivity. In a side collision the angles may result in the tape reflecting toward the driver only at the last possible second as the cyclist enters the headlights, too late to avoid the crash. On a hilly road the headlights might be zooming into the sky if the car is coming over a hill or might be dropping down at the bottom of a depression, and never illuminate your tape. And as noted above, the driver may not realize that the bright spot ahead is a cyclist's helmet. We have a page on using active lights that discusses this more. You need active lights if you ride at night.

Reflective Helmets
The first company we found with reflective helmets was the Swedish manufacturer Headlight, with a line of helmets initially branded Solid, but now in Europe carrying the brands of distributors or retailers. In the US their products appear as Reflectek, manufactured by Kuji Sports. They have a number of adult and child models with outer shells in silver. They say all of their helmets meet the Swedish standard for reflectivity, even after ageing. Headlight technology is available in several models, certified to either European standards for the Euro market or CPSC for the US market. They have two grades of reflective shells, so the whole helmet is reflective, using the silver color that normally produces the best reflective performance. They apply graphics on top of that.


In 2005 Kuji Sports introduced on the US market three bike helmets branded as Reflectek, one fully covered by a reflective shell, another with a partially reflective shell and a third with molded in the shell construction and partial reflectivity. The color of the fully reflective Reflectek is a dull silver, and it looks like a normal helmet in normal light. Here are photos of that Reflectek and two other helmets with reflective tape on them. The Reflectek is on the left, a neon yellow helmet with reflective rim tape in the middle, and a white helmet almost covered with reflective tape on the right. 

Although the tape is "hotter," the reflective material on the Reflectek covers the entire helmet. Rather than providing just a point of light, the Reflectek provides the image of a helmet, giving the car driver more of a clue as to what it is. For that reason we think the fully reflective Reflectek is probably less likely to disappear in the urban light clutter of a city street, although the intensity of its reflective surface is less than we would ideally want. The partially reflective Reflectek models would not have the same advantage, and the hotter tape would probably be better. But since there are few reflective helmets out there, a driver may not recognize that what they are seeing is a helmet with a bicycle rider under it.
We bought our sample of the Reflectek at Wal-Mart for $17.42. It has CPSC certification, of course. The warning label says "This helmet is not intended to promote night riding." Wal-Mart also had the partially reflective model, hanging on the same peg. Take a flashlight to the store if you want to see the reflectivity, and hold the flashlight up very close to your eye as you step back from the helmet. For comparison, check out the reflectors on the nearby bicycles.

The Bottom Line
Manufacturers will not spend the additional 25 cents for reflective trim on each helmet until consumers are willing to pay an extra dollar for a reflective helmet. There is one of those on the market, the Reflectek, and it sells for only $17.42. You might be willing to pay the dollar to add tape to your helmet, but manufacturers think that most consumers are not. So if you want to have a reflective helmet you can try the Reflectek, or otherwise you have to add the reflective surface yourself. It may or may not help drivers recognize you, but we think it does. It does not make you safe!


Reference:
Bicycle Helmet Safety Institute
4611 Seventh Street South
Arlington, VA 22204-1419 USA

 

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