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Clearance gauge (gabari) represents the signs or dimensions that determine the maximum width and height of vehicles, which we often see on many tunnels or overpasses nowadays. Enabling a safer journey during traffic, these signs represent a specific limitation. So, let's examine together what the clearance limit in traffic is.
How is the Clearance Gauge Calculated?
Since the calculation of the clearance gauge is an extremely important process, it is usually calculated by the municipality. In fact, commands determined by municipalities are taken into account in almost every issue related to calculations.
When making calculations, municipalities take into account the land length, surface area, and height of comparable structures. In this sense, to give an example, the product of the plot value and the comparable value represents the total construction area in square meters. The roof allowance is also deducted from the clearance gauge initially calculated for construction. How much area can be allocated for construction for one story can be calculated by dividing the total construction area by the number of stories.
What is the Clearance Limit?
Determining the clearance gauge dimensions is a situation based on the width and height limitations that vehicles traveling on the designated roads must comply with. In this sense, the clearance limit is the restrictions that ensure or restrict vehicles that will pass through bridges or overpasses to pass without causing any damage to these structures.
With the clearance sign, the width, length, or height of the vehicles passing through the structures are limited. Therefore, it can be said that it is a highly useful practice especially to avoid physical contact that vehicles may apply to structures. Used to prevent potential accidents and ensure traffic integrity, these limiting signs are positioned to be within the drivers' line of sight.
Especially today, frequent cargo transportation operations lead to the use of vehicles much larger than normal vehicles. For this reason, it is highly important, primarily, to prevent vehicles such as trucks or semi-trucks engaged in freight transport from damaging both the flow of traffic and the structures. In addition, since the signs may be damaged due to adverse weather conditions, periodic maintenance and replacements are carried out by the municipalities as well.
How Does the Clearance Gauge Limit Vehicles?
What the clearance limit includes and especially what needs to be paid attention to can be listed as follows;
• Maximum width of vehicles
• Maximum height of vehicles
• Maximum wheelbase
These three guidelines determining the limitation also contribute to vehicles traveling safer and hassle-free in traffic. Carefully determined to ensure vehicle safety, these limitations appear before drivers especially on roads where a certain width or height should not be exceeded. Vehicles such as trucks or semi-trucks that may create this dangerous situation can have a safer journey by following the signs.
What Does the Clearance Regulation Include?
The clearance regulation includes some important rules to ensure the safe passage of vehicles through designated structures. According to the regulation, the points to be considered can be listed as follows;
• Maximum weight
• Maximum width
• Maximum length
• Maximum axle load weight
• Maximum height
• Dimensional measurement tolerance
• Weighing tolerance
• Carrying capacity
What are Clearance Signs/Signals?
Clearance signs are boards indicating the limitations that determine the vehicles that can use these roads in various structures such as bridges and overpasses. It is highly important to pay attention during the journey to the signs that have a guiding feature for all vehicles that will use the current road. Therefore, these signs ensure that relatively larger vehicles are also directed to these roads.
They may appear in different forms depending on the limitations made on existing roads. Vehicles operating in accordance with the ratios determined within the limitations also need to perform road control in advance. Roads with limitations are ensured to be used accordingly.
Locations where limitations are applied within the scope of clearance signs may vary depending on the characteristics and structure of the road. For example, there may be limitations in areas with sharp curves, and the same applies to tunnels or overpasses where maximum heights are determined.
How Does the Clearance Gauge Affect the Carrying Capacities of Vehicles?
Especially, vehicles carrying freight must take into account the determined clearance limit to proceed on a designated route. In this way, it becomes easier to make road planning according to vehicles. If there are multiple limitations on the line followed by vehicles with high carrying capacity, the process is carried out by taking into account the lowest of these. In this way, almost all vehicles can have a safe journey in traffic without experiencing any problems.
How is Clearance Control Done? Which Methods are Used?
Complying with clearance signs/boards holds an important place in ensuring safety in vehicle traffic. Therefore, by performing a clearance check on vehicles, it can be determined whether the rules are followed or not. With the development of technology, the function of control mechanisms to give accurate results has increased. This has contributed to the increase of methods that can be used during control. The violation systems used can determine whether vehicle users comply with the rules by inspecting the height and width of the vehicles. Violation systems can usually be used in underpasses, tunnel entrances, or bridges.
