i have tried this myself and there seems to be a bug in the system, send an email to mapcreatoruk@here.com
and explain the situation and provide some screenshots.
It seems only roads is affected as adding POI and House Numbers are fine.
It seems the only way you can add a road is by turning off the speedlimit then once you added a new road you can turn it on again, no need to refresh the page., just make sure you click the cancel button at top and click back to map and you will be fine.
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This reply was modified 6 years, 3 months ago by .