please review:
you have used the tag highway=no_exit
on two nodes. The correct spelling is
highway=noexit.
Anyhow, one node was not the last in a highway, the other ends at a pier which also seems to allow to continue by foot or boat, so I've removed both.
See noexit=*

please review node/393990167
had confusing tags (bus stop and crossing), see my changes
changeset/35067602

please review:
you have somehow moved the node
node/30964000
by 139 m, some roads looked very strange.
I've placed the node at the old location.
See changeset/35067438

please review my changes reg. the mistagged and misplaced node
node/1816762566

thanks for the quick feedback :-)

please review:
I've tried to fix invalid tagging of node
node/1836811749
See changeset/35065527

:-)
okay, I'll remove it

please review:
node/63174448
The tag highway=flashers is only used here.
Is it a special form of highway=traffic_signals?

please review node/51104337
The tag highway=stop_light is only used here. Is it a highway=traffic_signals ?
There are more highway=traffic_signals
close to it.

please review
node/1751162352
The tag highway=maintenance is only used here, what does it mean?

please review
node/2432565550
I've changed highway=street_map to
tourism=information
information=map

I found amenity=parking_entrance, so I've changed it to that, see
amenity=parking_entrance

please note:
I've changed highway=gate to barrier=gate
node/3812729111
See also
barrier=gate

bitte erklären:
was beschreibt diese Relation?
Habe keine Erklärung für das tag
type=tmc:area
gefunden, nur für type=TMC.
Siehe auch
changeset/26524377
Ist das tag highway=A3.0 tatsächlich richtig?
JOSM meckert, wenn ich es auf class zurück ändern will:
class is deprecated, use highway instead (1)

oh, sorry, I sehe gerade, dass es gar keine boundary relation ist, sondern
type=tmc:area
Da muss ich mich selber erst mal schlau lesen.

great, thanks for the quick feedback :-)

vielleicht besser in Deutsch:
wenn es keine Absicht war, dann ändere ich es einfach zurück. OK?

I agree in all points, I think I'll post a link to this discussion in the tagging list asking for
comments. OK?

hmm, I wonder why we have these weird rules (in the wiki)
Thinking about it again it would be better to tag all of them as junction=roundabout and use a 2nd tag to express that it is possible to drive across the center.

falsch ist es bestimmt, aber ich verstehe nicht ganz, wie man ein Strassenschild als node auf einem highway richtig erfasst.
Es ist auch nicht ganz klar, ob hier ein traffic_sign=maxspeed, maxspeed=100 steht oder ob sich das tagging auf node/312283505 bezieht (traffic_sign=city_limit) . 100 kmh ist ja ausserorts Standard in D.