We stayed in Abu Dhabi so used the free shuttle bus from Zayed Sports City. Taxis are very cheap in Abu Dhabi, we worked out about £2 to get from our hotel to the bus departure point. Buses ran about every 15 minutes and were very well organised, with them telling you before the bus departed where they were going to drop off. The departure points back to Zayed Sports City were also very well signposted at the circuit with huge towers showing which bus departure point it was, so you couldnt get on the wrong shuttle bus back. We had a problem on Thursday evening when we got back from the pit lane walk as there were no taxis to be seen, so had to walk a few blocks. On Friday and Saturday on arrival back at the drop off point at Zayed Sports City there were plenty of taxis, although on Saturday we had 3 buses all arriving together so although there were about 30 taxis waiting was a bit of a free for all to get a taxi. Not sure what Sunday was like as we stayed for the Macca concert and managed to get a taxi back from the circuit, which bearing in mind they put a standard 20 AED on the meter before starting, cost us 65 AED, which based on exchange rate is about £12 which we didn’t think was too bad for a journey which took us about 20 minutes. The shuttle buses operated until an hour after the concert finished, so if you wanted to, could still get back by that means, although not sure how many taxis would have been around at that time of night.