Correction to: Eur Transp Res Rev (2014) 6: 267

https://doi.org/10.1007/s12544-013-0127-8

After publication of this article [1], it is noticed the article contained an error with eq. 12, the cs should be squared. The correct eq. 12 is provided below:

$$ \frac{\left|N\right|}{k_tH}={\Omega}^2\cdot \sqrt{\frac{{\left[{m}_s\cdot {m}_u\cdot {\Omega}^2-{k}_s\cdot \left({m}_s+{m}_u\right)\right]}^2+{c}_s^2\cdot {\Omega}^2\cdot {\left({m}_s+{m}_u\right)}^2}{d^2\left({\Omega}^2\right)+{c}_s^2\cdot {\Omega}^2\cdot {e}^2\left({\Omega}^2\right)}} $$
(12)

We apologize for the inconvenience caused.