Key Characteristics of the Horizontal Element
Interconnection of the Horizontal Elements. Similar to the effect of "pinning" barrier wall elements together, this unique feature in a low profile horizontal channelizer provides the key to roadway stability. As early Autobahn experiments revealed, curbs or mini-blocks that were unconnected were subject to dislocation by traffic impacts. Though independent curbs that were little more than parking lot bumper stops could be screwed into the pavement, that anchoring was insufficient for them to hold position. The more often the units took impacts, especially from heavy trucks, the sooner those units were sent into travel lanes, resulting in two problems. One was the mis-positioning of the unit itself, and the other was the risk to motorists with the abrupt vertical faces of units remaining in place. These problems were solved by molding into each curb a heavy steel hook that attaches to the adjoining curb with a washer and bolt. Early North American installations as far back as 1997 in some of the more hostile environments, with heavy truck ADT, are still solidly in place with no re-anchoring needed.
Height and Vaulting command motorist respect, the traffic engineers wanted a channelizer that was as tall as possible but one that, while being narrow, would not cause vehicles to vault above the separator on impact. QWICK KURB® , INC. achieves a height of 3.5" by using a unique two-tier profile allows tires to climb, level and climb again so that they do not rise above the top of the curb. This profile allows for a combination of a narrow width of less than eleven inches despite the intimidating 3.5 height. Single tier designs were found deficient in either height, width, or vaulting.
All Weather Durability. The Autobahn heritage of the QWICK KURB® , INC. System serves it well. Cold and snow were factored in from the beginning. In North America, over a decade of use in Southwestern dry deserts and southeastern humid subtropics to northern cold and snow belts in Michigan and Canada, allows QWICK KURB® , INC. to extend its five year warranty even for normal traffic hazard impacts. At over ten pounds per foot, the curb is manufactured from dense, durable recycled plastics such as those that exist in telephone and electrical cable. QWICK KURB® does not become brittle in cold temperatures, shatter with impact or warp like other product.
Observable at Night Traffic engineers wanted each motorists to recognize the raised profile of the curb at night as well as during daylight. They recognized that reflectors merely on top of the curb would actually mislead motorists to believe that they were seeing a flat surface. Thus, a profiled reflective device was developed and installed at intervals as close as one meter. The seven cat's eye reflectors facing motorists in each arc (L65) shaped device clearly show the raised profile of the curb in the dark.
Tapered Ends An important safety element requires the end of each run of curb to taper from the road surface to the top of the curb. Thus tapered end curbs were developed to attach to each run of curb. Note that these end curbs are interlocked to adjoining curbs in the same robust manner that individual curbs interlock with each other. Thus the end curbs are similarly unlikely to separate from the adjoining curb.
Water Drainage QWICK KURB® , INC. uses two methods for water drainage. On the bottom of each curb and end curb are molded-in or rubber "feet" that raise the curb slightly above the road surface. Water sheets beneath the curb in almost all circumstances. In a particularly high drainage position, the line of curb can be stopped and two end curbs can face each other, leaving whatever gap the traffic engineer desires. An important feature allows the retrofitting of such a gap if, unexpectedly a drainage issue occurs after installation. By simply removing one curb and substituting two facing end curbs, the traffic engineer creates a four inch gap for water run-off.
Ease of Installation The most burdensome and time consuming part of installation is drilling into the pavement to allow anchoring to be mounted. With the interlocking feature of QWICK KURB® only two holes per section are needed.
1916 US 41 South
Ruskin, FL 33570
©2014 QWICK KURB®, INC
Phone (813) 645-5072
Fax (813) 645-4856