Megatexture is a family of wave-shaped road surface characteristics. While vehicle suspension deflection and dynamic tyre loads are affected by longer waves (roughness), road texture affects the interaction between the road surface and the tyre footprint. Megatexture has wavelengths from 50 mm up to 500 mm. Other types of road texture are Microtexture

Microtexture

Microtexture is the collative term for a material's crystallographic parameters and other aspects of microstructure: such as morphology, including size and shape distributions; chemical composition; and crystal orientation and relationships...

 and Macrotexture

Macrotexture

Macrotexture is a family of wave-shaped road surface characteristics. While vehicle suspension deflection and dynamic tyre loads are affected by longer waves , road texture affects the interaction between the road surface and the tyre footprint. Macrotexture has wavelengths from 0.5 mm up to...

.

MeTx is a family of surface damages that, similarly to long wave Macrotexture

Macrotexture

Macrotexture is a family of wave-shaped road surface characteristics. While vehicle suspension deflection and dynamic tyre loads are affected by longer waves , road texture affects the interaction between the road surface and the tyre footprint. Macrotexture has wavelengths from 0.5 mm up to...

, is a cause of road traffic noise. MeTx also contribute to poor friction, as it cause variance in the tire normal load. Road agencies monitor MeTx by measurements involving highway speed laser/inertial profilometer

Profilometer

Profilometer is a measuring instrument used to measure a surface's profile, in order to quantify its roughness.While the historical notion of a profilometer was a device similar to a phonograph that measures a surface as the surface is moved relative to the contact profilometer's stylus, this...

s.