European Road Infrastructure Congress
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| Fig. 4. Star Rating of Motorways in Slovakia 2013
The key outcomes of the assessment were:
59% of the existing NDS network was assessed at 1 or 2-star standard with 35% at 3-star level and the remaining 6% at 4-star or better. The top four recommended improvements with a high return on investment were road safety barriers, shoulder rumble strips, clearing roadside hazards, and shoulder sealing. The NDS operational teams are planning to install 174km of safety barriers at a cost of €80 million, equip all their motorways with shoulder rumble strips, and remove dangerous roadside objects. Five upgraded sections of 327km were reassessed in 2016 to measure the success of the investment program and verify the improvement in star rating. The reassessment showed that the length of road rated at least 3-star had increased from 27% to 77%. 
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