In many countries experiments with different types of road surfaces have produced such products as “whisper concrete, ” where some of the aggregate is left exposed and consequently there is only random tire contact.
Eksperimenteerides erisuguste teekatetega, on paljudes riikides jõutud taoliste materjalideni nagu whisper concrete (sõna - sõnalt ’ sosinbetoon ’), kus kivikillustik on vaid osaliselt betooni surutud ning seetõttu on rehvide kokkupuutepind teega väiksem.