World Athletics president Lord Coe says the location of warm-up facilities at the World Championships in Tokyo is "not perfect", following complaints from athletes including Great Britain's Keely Hodgkinson.
Yoyogi Park, where the main warm-up facility is located, is a two and a half kilometre drive from Japan National Stadium, a bus journey which takes about 15 minutes.
It means athletes are catching a bus around an hour before they compete, with Olympic 800m champion Hodgkinson describing the situation as "draining".
Coe says transport and logistics have been a challenge but the organisers have done their best.
"We need to make sure that we have great transport systems," he told BBC Sport.
"It has been a challenge here because, of course, post-Olympic Games we lost the warm-up track we used during the Games.
"It is a little bit further away and we have had to deal with traffic flows at different times of the day, different days of the week.
"We have really looked at that. It isn't perfect, but I think the athletes are now recognising we've done everything we possibly could to make it as good as possible."