Politicians from Angela Merkel's Christian Democratic Union and their Free Democrat coalition partners are considering changing the law to allow the use of mobile apps and navigation systems equipped with the detectors, the Saarbrücker Zeitung newspaper said on Wednesday.
Germany has around 3,800 permanent speed cameras, which photograph speeding drivers and mail the car's owner a pricey ticket.
Most of them are installed at accident blackspots, Christian Democrat transport expert Thomas Jarzombek told the paper.
"It makes sense if as many people as possible, including out-of-towners, are made aware of the dangerous areas,” he said.
"We want to differentiate between traffic safety and a money-making racket," Jarzombeck said.
Free Democrat MP Oliver Luksic called the ban on radar warnings "outdated," and said Transport Minister Peter Ramsauer should look into the matter.
But not everyone agrees with allowing drivers to find out about speed cameras in advance.
Police union GdP chairman Bernhard Witthaut told public broadcaster ZDF speed enforcement cameras would continue to be posted in accident-prone areas and "in my opinion, those should not be announced."
The Saarbrücker Zeitung reported that a draft of the CDU and FDP proposal said that navigation devices should be permitted to inform drivers about speed cameras within a zone of about 500 metres.
"Thus, the particular area in which the driver exercises extreme caution is expanded," the draft said.