After conducting research, it appears that there is no boat ramp named "WMA access road" in Cumberland County, New Jersey. There are several boat ramps in the county, but none match that exact name or geographic coordinates.

However, based on information available about boat ramps in Cumberland County, the following can be discussed:

- The county operates several boat ramps that provide access to various bodies of water, including the Delaware Bay, the Maurice River, and Cedar Lake.
- The specific type of boat ramp can vary depending on the location and body of water. Some ramps are concrete or paved, while others are gravel or dirt. Some may have docks or other amenities.
- The width of the boat ramps can also vary, but typically they are wide enough to accommodate vehicles and trailers for launching and retrieving boats.
- The types of watercraft permitted on the water can also vary depending on the specific location and any regulations in place. Generally, boats, kayaks, canoes, and other non-motorized vessels are permitted on most bodies of water. However, there may be restrictions on motorized boats based on size, horsepower, or other factors.

It is important to note that the lack of information on a boat ramp specifically named "WMA access road" in Cumberland County means that the accuracy of any details about it cannot be verified.