The main function of road marking reflector is for warning and road guiding, not for road blocking. Thus bigger and higher reflectors will create greater hazard instead. At present, many road marking reflectors installed do not comply with legal requirement.
The 360 degree glass road marking reflector complying with CNS 13762 has been proven to be durable and economical on many road construction. Its reflection has no blind spot in any curve. Performance out beat any flat type reflector. Glass dome surface, maintenance-free; it is not easy to accumulate dirt and dust; the reflector does not come off easily and it has no sharp corners and hence provide smooth driving; if the glass shatters, it forms into very fine particles, which causes no damage to car tires.
Most semi-strengthened glasses cannot pass the steel ball impact test under CNS 13762, yet when surface of the glass was coated with a layer of transparent paint or film, purpose of absorbing the steel ball impact can be achieved. Thus, some of them may pass the inspection, yet this is an act of deceit. Although the clients might be deceived, these products cannot last under load from large vehicles on public roads. (Note: The thin layer can be easily washed away with solvent or gasoline prior inspection.)
The back tires of large truck are normally combined in pairs, and irregular sizes of stones may stuck between the gaps of two tires; when the truck travels at high speed, the stuck stones can run directly over the reflection marks, and the consequence can be simulated via using steel ball falling freely from certain height. Should the impact can be sustained from a steel ball with certain weight, falling from certain height, the glass marking reflector under direct impact of vehicles with stuck stones would not break easily or create many holes that effects reflecting functions.
The covering shell of A666 is fully strengthened, and the strength is twice of the other imitations. However, the unit price of A666 is very high due to its expensive internal component; should the semi-strengthened hand-made glass with low quality is used, the product will not only break easily without any economical or safety benefits, but creating sharp glass blocks after breakage that may penetrate car tires and causes dangers.
7 years ago, SIGLITE has been installed on the Freeway HSIN CHU section. During this period of time the contractor didn't make any maintenance. On the other hand on the close road section of Taiwan Freeway they have installed traditional plastic raised pavement markers which has been replaced 20 times during the same period of time of 7 years. The total cost for road markers, initial installation and replacements as well as for traffic management has been much higher than the cost for the initial and non-recurrent SIGLITE installation.
The reflective area of plastic road studs is twice larger than this one of 360 degree Tempered Glass Road Reflector. Therefore the retro-reflection of plastic road stud is higher compared with 360 degree Tempered Glass Road Reflector at initial stage . However, this advantage can only be held for 2 or 3 weeks, and the reflection value of new installed plastic road stud will decrease and be the SAME as this one of 360 degree Tempered Glass Road Reflector. In use on the lane with heavy traffic and heavy vehicles, most of plastic road studs will loose the retro-reflection within 1 month.
After 2 months in use on roads the plastic road studs have a lower reflection than 360 degree Tempered Glass Road Studs after 7 years in use. It becomes even more important in rainy nights. Siglite may have some small scratches on the surface after 7 years but because of capillary the rain will make up the deficiency and the reflection of installed Siglite will be as good as new. Of course the reflective mirror of installed Siglite is stressed under traffic load but it will be not damaged by vehicles; on the other the reflective screen of plastic road stud is pasted on the outer case, it will be damaged easily by vehicles because of the low surface hardness of the plastic material.
Seih-Ying Co., Ltd., had developed the twin colored (red/white) Siglite Tempered Glass Road Stud more than 10 years ago. Unfortunately the Taiwan National Standard – CNS13762- did not regulate this type of Tempered Glass Road Stud in order to prevent the remonstration by same business and query of collusive tendering. This type of twin colored Siglite markers are only marketed overseas but not in Taiwan. Referring to the experience of using hundred thousands of Siglite Tempered Glass Road Studs on Taiwan freeways observed by road checks, we never heard any complaints by road users.
We are convinced that the 360 degree Tempered Glass Road Stud which comply with CNS13762 are the best choice.
1.Environmental friendliness: Glass is an environmental friendly and recyclable material. The major element (70%) is SiO2. It's one of the most common element in earth. Concerning the trend of energy conservation and carbon reduction, glass is a better material choice compared with the difficult decomposable plastic materials (in order to prevent the deterioration by UV, the manufacturer has to blend anti-ultraviolet agents in the plastic which is not easy to be decomposed naturally.)
2.Lifespan: Regarding to the actual installations on Taiwan freeways it has been proven that the lifespan of 360 degree Tempered Glass Road Studs is over twenty times greater than the lifespan of plastic road studs.
3. Effective-cost: 「Short-lived goods must be cheap」, that is common sense. We also have to compare the installation cost (road marker, adhesive, installation, traffic management) and social cost (waste of time and gasoline due to traffic jam, work risk and risk of car collisions during road stud replacement).Detailed consideration over 5 years requires with plastic road markers a huge annual budget in order to replace many times the “cheap”plastic markers with short lifetime.