Hello together, last time I stumbled by chance over the following report of the oldtimer market: Since I am about to finish my oldtimer (model year 1979) something of course raises questions. Not that I intend to build a riot box but of course one would like to avoid the vehicle being shut down wrongly. Quotation: what a noise measurement on site should confirm: The measuring instrument shows a standing noise of 101 dB(A), although according to papers only 83 dB(A) are permissible Quote : there is no question of illegal noise because S. measures the noise of the Chevy in traffic control according to the wrong standard. Dekra test engineer Andreas Müller* makes the same mistake in his report, which he captures shortly afterwards on behalf of the service group Autoposer. Although he only comes to 95 dB(A) standing noise It is only 84 dB(A) when measured according to the correct standard: because according to § 49 of the road traffic registration regulations for cars with individual operating permits and First registration by 1 October 1983, a measuring distance of seven meters before, no near-field measurement from 0.5 meters. “There are about 17 dB(A) difference between the two measured values in the same car,” says Alex Piatscheck, long-standing GTÜ test engineer and one of the two owners of the oldtimer filling station at the Hamburger Elbbrücken. According to the legal standard, 5 dB(A) tolerances are added. What is missing from the pickup is a single letter in the vehicle papers: There is the St. andnoise of 83 db(A), but not the large N for the measurement method. “The letter is often missing. Sometimes it goes down at the full acceptance, sometimes the approval office forgets it. It is not mandatory, but should prevent confusion” So far, so good. With me 77 dB(A) are in the letter. Without the “N: Logically also no “P: My 88 Omega has the “P” and also a higher standing noise value, which is confirmed from the article because my BMW was in the stand in ever the case louder than the Omega. On Wikipedia I happened to find out the following: Quote: The driving noise is comparatively complicated to measure. Therefore, an additional value for the standing noise is given. It serves as an indication for the fast and uncomplicated information on whether the controlled vehicle complies with the specifications or has possibly been manipulated during the standing noise measurement. In the case of oldtimers prior to 1980, the police must add 26 dB to the registered value if there is no letter in the letter behind the stand dB number. In the case of younger vehicles with a P behind the dB specification in the letter, only 5 dB tolerance is added. Vehicles prior to the 1954 year of construction under There was no clearly defined limit; it was with the general rule of § 1 StVO that no “burden” could arise. In addition, during the construction of the vehicles the “general state of the art” had to be adhered to. This is all nice and right. If there is a control, however, it is questionable whether a printed article of the OMA and a reference to Wikipedia prevents a seizure, if the officials are not familiar with the regulations. I don’t really get to be smart from § 49a StVZO or it doesn’t result in how to measure or if a near field measurement is carried out, which is obviously permissible, how much – the tolerance is left out of it – has to be calculated on top of it due to the other measurement method. According to Wiki 26 dB…, but where is this still standing? Can someone help me?