Which type of roller is likely to leave unsightly pavement markings?

Pneumatic rollers are particularly known for their ability to create distinct pavement markings, often due to the way they compact hot mix asphalt. These rollers utilize inflated tires that exert a pressure on the surface of the asphalt as they roll over it, which can lead to the formation of tire prints or patterns. The combination of pressure and the heat of the freshly laid asphalt can result in visual defects, especially if the roller is not properly used or if the asphalt is too hot or too soft at the time of compaction.

In contrast, other types of rollers like static steel wheel rollers, vibratory rollers, and oscillation rollers typically flatten and compact the asphalt more uniformly without leaving as prominent markings. Static steel wheel rollers apply uniform pressure across their wheels but do not create the same level of indentation. Vibratory rollers use high-frequency vibrations to aid in compaction, which helps in achieving a dense mat while minimizing surface impressions. Oscillation rollers provide a lateral compaction action that further assists in achieving a smooth finish, reducing the likelihood of marking. Thus, pneumatic rollers stand out as the type that is more prone to leaving unsightly pavement markings due to their operational characteristics.