Traffic mainly, but also maintenance. Mechanisms needed to be inspected/serviced every N openings. Although the big fight was basically that 'Team Road' wanted

Traffic mainly, but also maintenance. Mechanisms needed to be inspected/serviced every N openings. Although the big fight was basically that 'Team Road' wanted the bridge to open twice a day at fixed times and if a boat missed its slot it just had to wait, while 'Team River' wanted the bridge to open within 10 minutes of any boat showing up.