"Filling every crack" has become the maintenance strategy of most provinces. Crack repair technology has evolved from traditional crack filling with modified asphalt and modified emulsified asphalt to the current use of specialized crack filling adhesives for slotting and caulking. Maintenance materials, equipment, and techniques have all seen significant advancements. With increasing traffic volume, the pressure from maintenance and repair work is also increasing. Consequently, a rapid and non-destructive crack repair technology (tacking) is gradually gaining popularity in China. This technology eliminates the need for grooving and directly applies the adhesive to the cracked surface. It offers high efficiency, minimal impact on the traffic environment, and prevents secondary damage, making it a promising application prospect.

Fog seal technology is evolving towards multifunctionality
Early fog seals primarily used emulsified asphalt. With the development of fog seal technology, reducing agent seals (rejuvenating agent seals) and sand-containing fog seals have emerged. Reducing agent seals (rejuvenating agent seals) use asphalt reducing agents to partially restore the properties of old asphalt, effectively restoring the asphalt. Sand-containing fog seals incorporate fillers such as clay and china clay into the original fog seal material, improving the fog seal's anti-skid and wear resistance. Fog seal technology is evolving from its initial sole function of sealing water to encompass multiple functions, such as restoring asphalt properties and improving pavement anti-skid performance.
Microsurfacing technology is evolving toward low-noise technology.
The primary challenge with microsurfacing is its high noise levels, which impact driving comfort. To address this, low-noise microsurfacing technology has been developed domestically. In 2013, the Beijing Municipal Highway Administration used low-noise microsurfacing technology to conduct preventive maintenance on six roads, covering a total area of ??366,000 square meters. On-site noise testing was conducted after the roads opened to traffic. The test results showed that the noise level after microsurfacing was significantly reduced compared to before the treatment. Driving noise levels were still higher than those on other roads, based on driving experience and on-site observations, but were still acceptable.
Chip seal is being widely used on ordinary roads.
Chip seal is applied using a layer-by-layer method. It is inexpensive, requires simple equipment, and is easy to use, resulting in a fast installation process. Precisely because of its high cost-effectiveness, chip seal technology has long been widely used in Europe and the United States. Chip seal technology is also well-suited to my country's conditions. Of my country's over 4 million kilometers of highways, 104,000 kilometers are expressways, nearly 420,000 kilometers are first- and second-class highways, and the vast majority are third- and fourth-class highways. Besides expressways, chip seal technology is also suitable for preventive maintenance, construction, and reconstruction projects on other highways.
Overlay technology is evolving towards thinner overlays.
Traditional overlays are at least 4 cm thick. Thin-layer overlays are thinner than traditional overlays. Thin and ultra-thin overlays are typically not used as a pavement structural layer, but rather as a wearing layer. As long as the surface function meets the required requirements, the thinner the thickness, the better the economic benefits. Currently, with technological advancements, new materials, equipment, and technologies are being applied to overlay projects, driving overlay technology toward ultra-thin finishes. Examples include dense-graded ultra-thin overlays using warm-mix technology, open-graded ultra-thin overlays using Shell technology, and ultra-thin overlays using rubberized asphalt technology. Currently, the thinnest overlay thickness achievable is under 2.0 mm.