I raised an idea a number of months ago about showing speed limit data on the maps. I mentioned I currently use ITOWorld mapping for this.
I contacted them to see if they had an api or some other way to get the data and they replied to say that's it's already out there as open source data through OpenStreetMap.
I've had a look at OpenStreetMap and sure enough, every road had a data tag for it's speed limit (see attached pic).
As MRA already uses OpenStreetMap surely the developers could pull this data in as well. Perhaps as an additional layer as you have done for traffic.
I can't tell you how helpful and great it would be to create routes where we had speed limits for roads highlighted.
So is this a (relatively) easy feature to introduce?