No. About 10% of the German autobahn is under construction (at least partially). About 70% is regularly w/o speed restriction, temporary limits due to construction projects not counted. That is not a small amount, hence the /s. You can drive as fast as you want on ~2/3 of our autobahn kilometers.

Only about 70% of Germany’s autobahn is w/o restrictions (ignoring from construction), so really it’s almost nothing. /s

for the the tax break? 😉