Flickr via J Matute

The fourth official CicLAvia takes place this Sunday at 10 a.m.

DOWNTOWN LOS ANGELES — The fourth official event is gearing up to take over Downtown streets this Sunday, and ironically, for one of its sponsors, Metro.

About 35 bus lines, will be impacted from 9 a.m. to 5 p.m., by the event aimed at promoting use of public transportation, bicycles and exploring the city.

CicLAvia community organizer Joe Linton said that while there will be some inconvenience for Downtown Metro riders, a series of "soft" closures will allow buses through every four or five blocks to minimize detours on streets like Figueroa Street and Broadway.

As one of CicLAvia’s main sponsors, Metro is supportive of the event -- even if it does require some route adjustments.

Dave Sotero, a spokesman for Metro, said the detours will force Metro to pick up riders as close to their original bus stops without interfering with the pedestrian-filled streets of the festival.

This will also mean Metro's rail line will be a popular choice for bicyclists and other attendees. Riders can take the Red or Purple Line stations to Civic Center, Pershing Square and 7th St./Metro Center and be within three blocks of the event.

On Sunday, six cars will be used on the Red and Purple lines (the maximum number), and the Gold line will also add a car. They will pass through every 10 minutes instead of the usual 12, Sotero said.

Though an exact number couldn't be given, Sotero said there will be a very large number of bicycles on Metro's rail lines during CicLAvia.

“We’re putting out everything we have on Sunday,” Sotero said.

Use of the rail line will also fit in perfectly with CicLAvia's promotion of trying new things, Linton said.

"We get a lot of people saying, 'I grew up in L.A. and I've never been on the train,'" Linton said.

Sotero also hopes that while cyclists enjoy the ease of public transit, they also , including not blocking anyone's way on the train.

Even with efforts to promote the use of public transportation, many people are expected to drive to the event.

Linton estimates somewhere around half of the tens-of-thousands of CicLavia participants will be using their cars to get to the event.

It's fine to drive, as it might be the most reasonable option for families traveling from long distances, he explained.

When determining where the route should be, Linton said three main considerations are taken: how dense the area is, how few parks it has and CicLAvia's connections with their public transit authority.

We choose places that have a sort of Downtown-feel, he said.

to see the event map.