Experts say that limiting speeds on highways to 120 kilometers per hour (74.5 mph) would save 2.6 million metric tons of carbon dioxide a year.A limit of 100 kmh (62 mph) would more than double the savings, according to Germany’s Environment Agency.Those annual savings would make a significant contribution to closing the remaining emissions gap in Germany’s transport sector of 118-175 million tons by 2030.To achieve this, Germany will have to double its current rate of emissions cuts by the middle of this decade, then triple them from 2030 onward, the ministry said.It noted that significant measures have already been put in place to increase renewable energy generation and to ramp up the production of hydrogen for industrial use."