The administration has invested around 252,000 hours of manpower into cleaning up litter on the roads over the last six years.
Green Party ministers Dieschbourg and Bausch provided the figures in a response to ADR MP Jeff Engelen's parliamentary question.
According to analysis from 2015, an average of 216 kilos of waste is collected per kilometre of motorway, compared to 103 kilos per kilometre along country roads. By weight, glass and plastic cans and bottles represent 60% of litter.
A national campaign, "Offall kann déidlech sinn" ("Waste can be deadly") is designed to draw attention to the impact that litter can have on animals and livestock, when the latter eat food that contains sharp pieces of glass or metal.
As well as the campaign, the National Plan for waste and resource management is seeking to reduce single-use packaging in order to meet European directives for zero waste.
Littering comes with financial sanctions: throwing a paper or a cigarette butt in the street costs 49 euros, illegally disposing of an electrical device can result in a fine of 145 euros. These amounts are due to be revised upwards when the legislation on waste has been adapted.
The ministers were reluctant towards Engelen's proposal of replacing or accompanying the financial sanctions by measures such as the imposed collection of waste along the roads. The ministers' response said they did not think this would minimise the issue.
