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Comparative Life Cycle Assessment of Geosynthetics versus Conventional Construction Materials ii assessments. However, uncertainty due to variability in gravel density and in matching the thickness of the layers (95% interval of+/-7%, or about+/-3.5 cm for a 50 cm gravel layer) or of transport services required (95% interval of about+ 100%/-50%) is taken into account. Sensitivity analyses are carried out to further explore the reliability of the results. On one hand the thickness of the filter is varied in case 1 taking into account different technical specifications. On the other hand four alternatives for road foundations are analysed in case 2. This includes 2 alternative road foundations using reinforcement with geosynthetics and two alternatives for the stabilisation of the road using cement or quick lime only.