The graph shows the nitrgoen oxide emissions produced by four vehicles. Summarize the information by selecting and reporting the main features and make comparisons where relevant.

The graph illustrates the relationship between vehicle type and speed in determining nitrogen oxide (NOx) emissions, measured in grams per kilometre. Overall, lorries consistently emit higher levels of nitrogen oxide than both passenger cars and buses across all speed ranges. While emissions from passenger cars decrease steadily as speed increases, emissions from lorries and buses […]