There are no hard rules here, but when looking at various cases and issues we came up with this guideline:
- If you need a truck to cross - consider splitting
- If Google actually paid gas money for SV and drove in both directions - consider splitting
- If you can't cross (completely fenced) - strongly consider splitting
- If the width of the median is more than 1 lane - consider splitting
- If the road is really wide on both sides - strongly consider splitting (in most cases anything 3 lanes and over in each direction is an excellent candidate).
- If destination are attached, and its dangerous to walk across"