An information retrieval arrangement for a host vehicle, said arrangement being configured to retrieve information of at least one surrounding vehicle (5, 6), surrounding said host vehicle, said arrangement comprising: - a registration plate reading arrangement configured to read registration plate information of said at least one surrounding vehicle (5, 6), where the arrangement further comprises: - an information retrieving unit configured to retrieve from a database (11.1, 11.2) at least one dimension (w, l 5) of said at least one surrounding vehicle (5, 6), based on said read registration plate information, and being characterized in comprising: - a surrounding vehicle monitoring unit (15.1, 15.2) configured to detect presence of, and distance (d 5) to, a first preceding vehicle and presence of, and distance (d 6) to, a second preceding vehicle, where said information retrieving unit is configured to retrieve from said database (11.1, 11.2), a length (l 5) of said first preceding vehicle based on read registration plate information of said first preceding vehicle and where said arrangement further comprises a calculating unit configured to calculate a distance (d 5,6) between said first preceding vehicle and said second preceding vehicle by subtracting said distance (d 5) to said first vehicle and said length (l 5) of said first preceding vehicle from said distance (d 6) to said second vehicle.. - a registration plate reading arrangement configured to read registration plate information of said at least one surrounding vehicle (5, 6), - an information retrieving unit configured to retrieve from a database (11.1, 11.2) at least one dimension (w, l 5) of said at least one surrounding vehicle (5, 6), based on said read registration plate information, and being characterized in comprising: - a surrounding vehicle monitoring unit (15.1, 15.2) configured to detect presence of, and distance (d 5) to, a first preceding vehicle and presence of, and distance (d 6) to, a second preceding vehicle, where said information retrieving unit is configured to retrieve from said database (11.1, 11.2), a length (l 5) of said first preceding vehicle based on read registration plate information of said first preceding vehicle and where said arrangement further comprises a calculating unit configured to calculate a distance (d 5,6) between said first preceding vehicle and said second preceding vehicle by subtracting said distance (d 5) to said first vehicle and said length (l 5) of said first preceding vehicle from said distance (d 6) to said second vehicle.. - a surrounding vehicle monitoring unit (15.1, 15.2) configured to detect presence of, and distance (d 5) to, a first preceding vehicle and presence of, and distance (d 6) to, a second preceding vehicle, where said information retrieving unit is configured to retrieve from said database (11.1, 11.2), a length (l 5) of said first preceding vehicle based on read registration plate information of said first preceding vehicle and where said arrangement further comprises a calculating unit configured to calculate a distance (d 5,6) between said first preceding vehicle and said second preceding vehicle by subtracting said distance (d 5) to said first vehicle and said length (l 5) of said first preceding vehicle from said distance (d 6) to said second vehicle..