According to Zehntner, the Swiss manufacturer of testing instruments, despite some initial costs, quality control quickly pays for itself, especially with budgets getting tighter. Its solutions include three models which can be used according to requirements. For example, its ZVR 6000 is primarily designed for the fast comparative assessment of the night visibility (RL) of road markings. However, says Zehntner, the ZVR 6000 can accomplish much more including the inspection of dry or wet road markings under