You're not the first person to wonder this! I've walked the Primitivo twice. The first time I managed to bamboozle myself making my way from the Cathedral. So the second time, I did a 'reccy' the afternoon before to make sure I knew where I was going the next morning. To be honest, in reading the extract below, I don't think that's what I did either time - but I managed to find my way. All the best.
This extract from
Wise Pilgrim should help - link is below the extract.
THE ROAD
The road out of Oviedo is notoriously confusing. To make matters worse, there are too many shells on the ground to be helpful, especially in the center. They mark several of the caminos into, and out of, Oviedo. There is no distinction between the two directions.
This is how it is done:
1. With the main facade of the Cathedral to your back, walk to the opposite end of the plaza and take the exit on the right. This is the
Calle San Francisco.
2.
San Francisco ends when it meets
Calle de Uría (350m from Cathedral). Turn right and follow
Calle de Uría. For the first 250m, the
Parque de San Francisco will be on your left. Stay on this road, regardless of arrows or shells. It is about 700m long and ends at the train station.
3. At the train station, turn left along the
Calle de la Independencia. Stay on the right-hand side of the road. You will pass 7 cubist looking apartment buildings before the sidewalk turns sharply back to the right. Follow the turn and cross the road towards another cluster of 4 similar buildings with a plaza in front. From here it is safe to follow the arrows.
4. At the end of the plaza is a roundabout. Cross to the left (clockwise) twice and turn left along the
Calle de la Argañosa. When it turns to the left (700m) you should turn towards the right, looking out for the pedestrian bridge which crosses the train tracks.
5. The arrows from here zigzag you through new development which ends quickly. By the time you get to an urban looking track and have left
Oviedo behind, you will have covered about 3.6km.
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