Forum: gaming.stackexchange.com
Tags: <pokemon-go>
Title: Can I catch Pokémon when I move very quickly?
Question: Assumed I am in a train or car (only co-driver!) with high speeds. Can I catch Pokémon anyway although my environment passes very quickly?

Answers:
sents: text: Yes this is possible, after tapping the Pokémon, your movement speed does not affect the catching period.
text: I have been catching them during hi-speed train travels myself without any problems so far.
text: update
text: Since the last update, Pokémon spawn rates during high speed travel have been reduced significantly.
text: This to prevent people from playing and driving.
text: The limit seems to be somewhere between 60 and 70 Km/h.
text: During travels between 15 Km/h and 60 Km/h a reduced catch rate is observed as well, in combination with a higher escape rate.
text: TL;DR : It is still possible to catch Pokémon while moving fast, up till certain speeds, and with reduced efficiency.
answer_details: author: gaming.stackexchange.com/users/46771/Dimitri mx
score: 61
sents: text: Yes, if you tap the pokemon it doesn't matter if you are a long distance away.
text: I do it myself during public transport.
answer_details: author: gaming.stackexchange.com/users/148364/Riley
score: 10
sents: text: I noticed a huge decrease in catch rate.
text: I used an incense on the highway traveling 100kmh.
text: I encountered 28 pokemon and only caught 8.
text: Most ran away after the first poke ball.
answer_details: author: gaming.stackexchange.com/users/156851/Jesse
score: 4
sents: text: In Ingress there is a speed limit for particular actions.
text: To be able to hack or attack a portal, or place a resonator onto a portal you'll have to move at maximum around 25-30 km/h and to collect energy you'll have to move at maximum around 70-80 km/h.
text: I'm pretty sure that Niantic will limit speed in Pokemon GO, too.
text: Also in Ingress turning off and on GPS is considered as cheating.
text: My guess is that this would be checked in Pokemon Go, too.
text: If they haven't set controls for these limitations yet, they most probably will do it in near future.
answer_details: author: gaming.stackexchange.com/users/82644/Montag451
score: 3
sents: text: Past a certain speed, your radar won't be able to detect nearby Pokemons as effectively (or at all).
text: For me, detecting Pokemons worked well in slow public transport such as city buses, but stopped for regional trains for example, except when the train was slowing down and approaching a station.
text: However, once a Pokemon is detected and the fight is started, you can catch it independently from the speed.
text: Also note that Egg Hatching will generally not work inside a public transport, since it uses a combination of GPS and pedometer to calculate the distance you've walked (so it will notice that you are not actually walking).
answer_details: author: gaming.stackexchange.com/users/154056/Jonathan Zimmermann
score: 1
sents: text: Yes, you can still catch pokemon while on a freeway, but I only managed to catch 1/2 of them.
text: The best way to get a Pokemon on a road is on a slow city bus.
text: I got about 6-10 Pokemons while being on a bus for about 1 hour.
answer_details: author: gaming.stackexchange.com/users/164540/P0k3m0n_Hunt3rl0v3r
score: 1
sents: text: Last weekend, 9/3/16, I went on a two hour road trip.
text: My husband was driving.
text: When we were going about 70 mph
text: I was able to engage pokemon, but after catching in a pokeball, 9 out of 9 escaped and ran away.
text: I use to be able to catch them when we went on this trip, but since every one ran away, I don't think you can anymore.
answer_details: author: gaming.stackexchange.com/users/165929/Julie
score: 1
sents: text: I do believe now from the newest update even if you do find Pokémons while driving at high speeds they will run away after the first pokeball that has hit it
answer_details: author: gaming.stackexchange.com/users/161727/George
score: 0

Summary of the answers:
If you tap the Pokémon, your movement speed does not affect the catching period. Once a Pokemon is detected and the fight is started, you can catch it independently from the speed.   
After encountering a pokemon, in Pokemon Go, it can be catched, no matter the speed. There might some limits to that, though.