Changes

(Bus line 9, "Huelva" stop. Or just walk from the city centre.) Walk to "Puente de San Rafael" and cross it. When you reach a roundabout, turn to your right to Avenida de Cadiz, and continue following the right sidewalk. In 500m you will reach a Repsol petrol station, then a CEPSA, then eventually another 1km away is a BP https://goo.gl/maps/DcESP3n7SH12. This is the closest station to the highway and where one hitcher got picked up (after a 5 hour wait!) in 2016. Try to get a lift to the next petrol station in the motorway or to "La Carlota", a town 30km away from Córdoba.

Early in the morning there will be a lot of traffic going outside Cordoba (in 2016 this wasn't really the case), but it decreases as it is getting late. In the afternoon/evening, almost all traffic will be local.>> Seriously. I started at 9:00 which was apparently already too late in the day. If you get desperate, You can walk about 1 km more down a bridge and you will reach an industrial estate (<not sure where this is). Try to find the entrance to the motorway, make a good banner and try from here. Consider to write "Proxima gasolinera" (next petrol station) at the back of your destination, to increase possibilities. Remember that in Spain, to hitchhike in motorways and it entrances is forbidden. Take your time to understand traffic flows, since the estate is chaotic. Considering all this, be strategic to choose a good place.