If you live along a rural road without regular pickup traffic, you will only produce for yourself, as the cost to get it to a faraway market is prohibitive. So you will produce for your own needs, and a safety reserve for if harvest is bad. Meaning if you have surplus, all your neighbors will have the same surplus product. Without transport, you can imagine the prices you will get. If you don't have enough (one year in 3 or 4) without transport the prices will skyrocket. Only when there are decent roads AND enough pickups going to the market you can begin to produce with the objective to sell. This means you will also be able to go for real cash crops. The prices will be better too, as the cost of transport per unit is lower. Decent roads to the market means that the distance to the (untarred) road can be a few miles, but there it should be, if you want to develop agriculture. You cannot carry an hectare worth of pineapples on the back of a motorcycle. You can expect a time lag of 3 to 5 years between the coming of the road and the establishment of a real market linked agriculture, with regular road transport. And only if you are investing also in the transport sector, what apparently nobody in Cameroon does (or do they have those tax barriers every few miles I have seen in other African countries?) Of course, if you don't want to invest in agricultural development, the road should only be good enough to bring the farmers to town to find a new life.