Motorcyclist Behaviour on Bends Figure 10. Variance of lateral position over seven bend sections (with standard error bars). doi:10.1371/journal.pone.0029978.g010 The final analysis conducted on the right-hand hazard bend was a comparison of the variance in lateral position across rider group and road section. There was a significant main effect of rider group (F(2,58) = 3.636; MSe = 0.197; p,0.05) which revealed that advanced riders (mean = 0.79 ft2) varied their lateral position more 2 than the novices (mean = 0.43 ft ; p,0.05). The experienced 2 riders (mean = 0.71 ft ), were not significantly different to the other two groups. There was also a main effect of section (F(6,348) = 12.252; MSe = 0.645; p,0.001) and a significant interaction between rider group 6 section (F(12,348) = 1.895; MSe = 0.645; p,0.05). Simple main effects analysis revealed that the effect of section was significant for all three rider groups. Novices increased lateral variance between sections 5 and 6 (p,0.05) and decreased lateral variance between sections 6 and 7 (p,0.05). Simple main effects revealed that the only significant differences between rider groups occurred in section 6, immedi- ately following the initial location of the hazard (F(2,58) = 4.658; MSe = 1.117; p,0.05). In this section, advanced riders varied lateral position more than the novice and experienced riders, but only the difference between advanced and novice riders reached statistical significance (p,0.05). Therefore, the interaction between rider group 6 road section mainly stems from the advanced riders increasing lateral movement after the hazard as they move towards the centre line in preparation for next bend. These findings are illustrated in Figure 13. Responses to the right-hand non-hazard bends As with the left-hand non-hazard bends, a series of 3626267 ANOVAs were conducted on data for speed, lateral position and the variance of lateral position, comparing the three rider groups Figure 11. Average speed for different sections of the right-hand hazard bend (with standard error bars). doi:10.1371/journal.pone.0029978.g011 PLoS ONE | www.plosone.org 10 January 2012 | Volume 7 | Issue 1 | e29978