###### Abstract  
Colored asphalt pavements have been implemented in South Korea to enhance visibility and lane distinction; however, color fading, accelerated deterioration, and increased pothole occurrence have been noticed. As a solution, alternative materials that can be used for the construction of colored asphalt pavements are being explored. This study evaluates the feasibility of using mudstone aggregate in constructing colored asphalt pavement in South Korea. Initially, aggregate quality tests were conducted on mudstone samples to assess their suitability compared to standard criteria. To enhance the visibility and color retention of colored asphalt, addition of pigment in the colored asphalt pavement mixture was considered and evaluated. The asphalt mixtures were evaluated for deformation, crack and viscoelastic properties using the Kim test, indirect tensile (IDT) strength test, and dynamic modulus test, respectively. Results showed that mudstone aggregate exceeded quality standards and the colored asphalt mixtures demonstrated superior deformation strength and crack resistance compared to typical SMA. However, the addition of pigment slightly reduced these properties. Overall, the findings suggest mudstone aggregate as a viable alternative for constructing colored asphalt pavements, offering potential improvements in durability and color retention. colored asphalt; mudstone aggregate; Kim test; IDT strength test; dynamic modulus test 4.0. Colored pavement highlights the prominence of transit systems. It visually enforces dedicated transit spaces, making it clear that a lane is exclusive to buses. This implementation has reduced vehicle incursions by 30-50%, supporting on-time performance and reliability [6]. In Seoul, bus-only lanes have been applied on the city's road network as an implementation of a policy in promoting public transportation to decrease the amount of private vehicle usage, thus minimizing the traffic congestion [1]. To make it more distinguishable, colored asphalt pavement has been used with a dark red coating on the surface and a solid blue side lane marking to indicate that private vehicles are prohibited from crossing the lane. Initially, the visibility of colored pavement was greatly distinct and clearly different from the general road after installation. However, significant fading of the dark red coating has been observed over time, especially on the wheel path, due to the passing of vehicles [7]. Moreover, the deterioration rate of the colored asphalt was found to be more severe compared to regular asphalt pavement due to the contraction and expansion induced by the pavement's sensitivity to seasonal temperature change. Furthermore, a surge in the occurrence of potholes on the bus-only lane has been noticed, with 69% of the total bus-only lanes having potholes. In 2011 [8], [PERSON] evaluated various coating methods according to their color maintenance when applied to colored asphalt pavement. Laboratory and field tests were conducted to evaluate the coating method's resistance to discoloration and fading, coating adhesion, and skid resistance. Laboratory tests included the ultraviolet test, adhesion test, and Taber abrasion test, while field tests included the British pendulum test and visual inspection. The results showed that coating methods consisting of elastomers and rubber epoxy both performed better compared to other coating methods without the mentioned materials for both the laboratory and field tests. However, after 100 days of exposure to traffic, all the coating methods, regardless of the material used, showed unsatisfactory results in terms of color maintenance, abrasion, and adhesion. In 2017 [9], the Centre for Pavement and Transportation Technology at the University of Waterloo, in collaboration with the Regional Municipality of York, investigated the functional and structural performance of BRT-dedicated colored asphalt pavement sections in Ontario, Canada after three years of service.