What do you do?
What do you do?
Slow down in case they change: Only sensible option. Perhaps in some situations you could speed up to get past before the change but it doesn't gain you much.
Better to get there in one piece.
It depends - if I see them turn green when I am relatively close to them I continue at my current speed. I also watch the other lights of the junction, or the pedestrian lights, they will often give a clue as to how close to changing my lights are.
If I know the junction then it's likely I know how long it will be until they change, in which case speed can be adjusted as necessary (local limits allowing of course). If not, then continue at usual pace until I get close enough to make such a call. Enough to take foot off accelerator and cover the brake.
See if there's a bmw/white van nearby if not put foot down.
Again, it depends. Mainly on three factors - how long they've been on green (if known), how far I am from approaching them, and the layout (direction of approach & exit).
If I have a good chance of getting through them safely in time before them changing, I will maintain or increase speed when possible.
If it's unlikely I'll get through this time, I'll maintain or lower my speed so that when they do turn green, it's an efficient process. Essentially, the goal here is to try and keep moving but without coming to a complete stop.
To me, it's not a black and white situation of either just speeding up or slowing down - all other things that you need to consider when driving (weather conditions, visibility, driver skill, vehicle conditions, other road users and so on), also need to be accounted for.
Maintain a steady speed until conditions dictate otherwise.
If only there was an option for "It depends on what mood I'm in." :p
In all seriousness it depends on varying factors. If it's bad weather (rain, snow, ice etc.) and/or if there's a car in front of me at a close distance - I'll slow down. If it's a hot summer's day or 'neutral' weather and/or if there isn't a car in front of me within close distance - I'll maintain speed towards the lights. I've never 'sped up' towards lights, only accelerated if I've not been able to brake and need to carry on across. I only put my brakes on to ensure I stop if it's safe for me to do so - no point slamming the brakes on when they turn amber if you've already arrived at the line or if the car behind isn't at a clear enough distance - you have to take consideration of their reaction to your action. There's a perfectly reasonable delay between the lights on one side going red to the other side turning Red-Amber anyway.
I agree with @twin--turbo
Continue at your current speed, but be prepared to stop should the lights or other conditions warrant it.
At no point should you deliberately speed up to get through the lights..
What do I do at the lights,
Use common sense,
Something some other road users seem to have miss-placed
Traffic lights should be configured to display a sufficient amount of "amber" depending on the speed limit - so faster roads will have more time between green and red. Thus you should be able to safely (and legally) pass through lights should they begin to turn to red.
If they don't, then the local authority aren't doing their job properly (perish the thought ;) ).
When I left earlier, it was 50% each way and now the sensible "slow-downers" have it. A triumph of sensible driving over boy racers!