Isabella Flores
Road markings are essential for highways and other streets as they guide drivers in merging, turning, and changing lanes, as well as telling pedestrians how to act safely around roads. The process of painting these lines is meticulous and requires specific equipment to ensure proper application. There are different methods for applying road markings, including tracing over existing lines, using measuring tapes and chalk lines, or using a computer-controlled road marking vehicle. The type of paint used is also important, with thermoplastic paint being a common choice due to its ability to be heated and quickly set. Glass beads are also added to the paint to provide retroreflectivity, which helps the lines be more visible to drivers.
| Characteristics | Values |
|---|---|
| Purpose | To guide drivers in merging, turning, and changing lanes and to tell pedestrians how to act safely around roads |
| Colour | Yellow lines separate traffic moving in opposite directions, white lines separate traffic moving in the same direction, and orange lines are used when the direction of the road is altered temporarily for construction projects |
| Line type | Dashed lines indicate passing rules |
| Application | Thermoplastic paint is applied using specially designed vehicles, including laying prams and ribbon guns |
| Preparation | The area is closed off, and plastic cones and signage are placed to guide motorists; the area is mapped out, and the type of highway marking is determined |
| Technique | A setter or "pitik" draws the layout of the new line markings using a long string coated in pre-marking powder, followed by a stepper or "tapak" who steps on the string to ensure a straight line |
| Equipment | Road marking machines, hand-push pre-markers, road marking removers, traffic cones, pre-heaters, hand dispensers or glass bead dispensers, laying prams |
| Crew | A steersman operates the road marking vehicle, following the marked spots plotted by other crew members; another crew member operates the paint guns at the back of the vehicle |
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Preparation and planning
Before painting straight lines on the road, there are several important preparation and planning steps to be taken. Firstly, the area must be closed off and made safe. This involves placing plastic cones and signage to guide motorists and pedestrians away from the work area.
For new layouts, the next step is to map out where the lines need to be applied and the type of highway marking that will be used. This can be done using measuring tapes and chalk lines. For rehabilitation projects, existing road line markings are retraced, and new spots are marked where the old lines cannot be distinguished or need to be changed.
A setter or "pitik" then draws the layout of the new line markings using a long string coated in pre-marking powder. They are followed by a stepper or "tapak", who steps on the string to ensure a straight line. The stepper will then mark the ideal spot for line markings with dots to guide the person painting the lines.
The paint must then be prepared. This involves cooking the road marking paint in a kneading machine, which turns the powder into a liquid form that can be easily applied to the road surface. The paint is heated to around 200°C (400°F) before being fed into the application apparatus, such as a screed box or ribbon gun.
Once the paint is prepared, the application process can begin. A steersman pushes the laying pram along the road as it dispenses thermoplastic paint, following the marked spots laid out by other crew members to ensure straight lines. Another crew member operates the paint guns at the back of the vehicle, monitoring and adjusting them to maintain the line's smoothness and straightness.
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Painting methods
Painting straight lines on the road is a meticulous process that requires specific equipment to ensure proper application. The process begins with closing off the area and placing plastic cones and signage to guide motorists. The next step involves mapping out where the paint needs to be applied and the type of highway marking to be executed. For rehabilitation projects, existing road line markings are retraced, and new spots are marked if the old lines cannot be distinguished or need to be changed.
To mark the layout, a setter or "pitik" uses a long string coated in pre-marking powder to draw the layout of the new line markings. A stepper or "tapak" follows the setter, stepping on the string to ensure a straight line. They will then dot the ideal marking spots periodically to guide the person who will paint the road line markings.
The paint used for road markings is typically thermoplastic paint, which is heated to about 200 °C before being fed into an application apparatus, such as a screed box or ribbon gun. After the paint is applied, glass beads are laid onto the hot material to embed before it hardens. These beads provide retroreflectivity, reflecting incident light from vehicles back into the driver's field of view.
The actual painting process is carried out by a steersman, who pushes a laying pram along the road as it dispenses thermoplastic paint. The steersman follows the marking spots laid out by other crew members to ensure a straight line. The steersman must also move the vehicle at the right pace to maintain the correct thickness and width of the lines. Another crew member operates the paint guns at the back of the vehicle, adjusting them to maintain the line's smoothness and straightness.
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Equipment
Painting straight lines on the road is a meticulous process that requires specific equipment to ensure proper application. The equipment used for road marking depends on the scope of the project and whether it involves tracing over existing lines or creating new ones.
For new layouts, crew members first map out where the lines need to be applied and the type of markings required. They then use hand-push pre-markers to draw lines that will serve as a guide for the application. A setter or "pitik" uses a long string coated in pre-marking powder to draw the layout of the new line markings, followed by a stepper or "tapak" who steps on the string to ensure a straight line. They will then dot the ideal marking spots periodically to guide the person who will paint the road line markings.
For rehabilitation projects, professionals retrace existing road line markings. In cases where the old line markings cannot be distinguished or need to be changed, crew members mark new spots.
Once the layout is mapped out, the paint is cooked in a kneading machine, turning the powder into a liquid form that can be easily applied to the road surface. The paint used is typically thermoplastic road marking paint, which is heated to about 200 °C before being fed into the application apparatus, such as a screed box or ribbon gun.
The application process involves a road marking vehicle operated by a professional called a steersman. The steersman follows the marked spots plotted by the other crew members, moving the vehicle at the right pace to ensure the correct thickness and width of the lines. Another crew member operates the paint guns at the back of the vehicle, monitoring and adjusting them to maintain the line's smoothness and straightness.
In some cases, smaller projects may utilise paint rollers or hydraulic pump machines, while larger companies may use industrial vehicles with sprayers attached.
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Paint types
Painting straight lines on the road is a meticulous process that requires specific equipment and skilled workers. One of the most common types of road marking paint is thermoplastic paint, which offers increased durability, retro-reflectivity, and the absence of VOC solvents. Thermoplastic paint is a dry mix of binder resins, plasticizers, glass beads or other optics, pigments, and fillers. The thermoplastic mix is heated to about 200°C (400°F) and applied using specially designed vehicles or machines.
Another type of road marking involves the use of glass beads, which are installed on top of wet line paint to reflect light from vehicles. However, the use of heavy metals in the manufacturing process of glass beads has raised environmental concerns due to the potential release of these metals under certain conditions.
In some countries, oil-based paints may be banned, limiting the options to water-based paints. The choice of paint colour is also significant, with white lines typically separating traffic moving in the same direction and yellow lines used for opposing traffic. Solid lines are often used longitudinally to indicate the driver's proper position on the roadway, while broken lines may indicate passing rules or hazard warnings.
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Health and safety
Painting road markings is a meticulous process that requires specific equipment and trained professionals to ensure proper application and safety. The process begins with closing off the area and placing plastic cones and signage to guide motorists away from the work zone. Health and safety are paramount, and the crew must ensure that motorists and pedestrians are not at risk of encountering wet paint or hazardous conditions.
Before painting, contractors must map out the area, including the type of highway marking to be executed. This involves drawing lines as a guide for the application, retracing existing road markings, or marking new spots with string and pre-marking powder. This process ensures that the lines are straight and in the correct position, minimising the risk of errors that could cause traffic problems or confusion.
The paint used is typically thermoplastic paint, which is cooked in a kneading machine to turn the powder into a liquid that can be easily applied to the road surface. The steersman, a trained professional, operates the road marking vehicle to follow the marked spots, painting the road with straight lines. They must move at the right pace to ensure the correct thickness and width of the lines. Another crew member operates the paint guns, monitoring and adjusting them to maintain the line's smoothness and straightness.
The health and safety of the crew must also be considered during the painting process. They must wear appropriate protective gear, including respirators to avoid inhaling paint fumes, and follow safety protocols to prevent injuries. The crew must also be mindful of their surroundings, ensuring that passing motorists or pedestrians are not impacted by the paint application process.
In addition to the traditional painting methods described above, there are alternative health and safety considerations for creating road markings. Rumble strips, for example, are a common alternative to painted lines. These are simple troughs ground out of the asphalt or raised strips glued or painted onto the surface. They provide a similar function to road markings without the need for paint application, which can reduce the health and safety risks associated with paint, such as exposure to fumes or slips and falls on wet paint.
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