"106 Express bus(106急行バス : Hyaku-roku kyuko bus)" is not called "highway bus",
"R106(origin of this route bus nick)" is one of "National road", not Expway(toll road).
Anyway,
JR tain ticket/pass holder's special ticket for this bus :
http://blogimg.goo.ne.jp/user_image/42/33/f375bf39dcecdecb4ad12e8fc42b...大人(otona) : adult
盛岡 : Morioka
宮古 : Miyako
乗車(jou-sha)/降車(kou-sha) : getting in(fr,dep) / out(to, arr)
Request this at JR's ticket gate ASAP, calling "振替乗車票(furikae-josha-hyou)".
Just say "I(we?) will go to Miyako, 106 bus ticket(s) pls!" with showing Rail Pass.
(If you would like to speak in Japanese, copy to below and click speaker button)
すみません、宮古までバスで行きたいので、振替乗車票をお願いできますか?
http://voicetext.jp/(Sumimasen, Miyako made Bus de ikitai node, "furikae-josha-hyou" wo onegai-dekimasuka?)
bus color(standard) :
http://blogimg.goo.ne.jp/user_image/3c/6a/06696d554c0883720902c4d1119e...Already mentioned "106急行バス" is bus route nick,
bus operationg company is "岩手県北バス : IWATE KENPOKU BUS".(calling "KENPOKU BUS" enough)
(EN) Northern Iwate Transportation Inc.
Latest timetables(fr H29.4.1 = 2017. 1 APR) :
http://www.iwate-kenpokubus.co.jp/archives/10823/WC付(-tsuki) is restroom(toilet) with. (付 means with, added)
Other buses toilet break(about 10 or 15 min?) seems only one time at "やまびこ産直館 : Yamabiko Sanchoku-kan".
https://goo.gl/maps/2JQdEbGbfm72https://pbs.twimg.com/media/CYPw589UEAA1y1f.jpgやまびこ : echo (reverberatings in the mountains)
産直 : local foods, souvenir and more as direct shop
(short of 地場産品 : jiba-sanpin, and 直売所 : chokubai-sho)
館 : a hall(a building, a larger store)
http://web-server1.sakura.ne.jp/moriokalife/wp-content/uploads/2015/09...(note) but, you don't have time to shop at ease :)
Bus stops location :
http://www.iwate-kenpokubus.co.jp/_regular/map.htmlMorioka : 東口(higashi-guchi/EAST EXIT) No.7
http://travel.watch.impress.co.jp/img/trw/docs/705/232/04.jpg(timetable is not latest)
https://goo.gl/fcyjip (behind larger building is JR Morioka stn)
http://www.jreast.co.jp/e/stations/e1565.html (stn map)
https://blogs.yahoo.co.jp/adiantum_blue0927/8864267.html(timetable is not latest)
Miyako : other side of station house No.6(Northern side, No named exit, small staiton)
https://goo.gl/maps/etEYyCa4PCnhttp://4.bp.blogspot.com/-B2PQ6QcSuPk/Vo1NkYmeMoI/AAAAAAAAiYI/ybuN5h-m...There is a coin locker at Miyako station, but if you come back to Morioka on a day trip,
lockers at Morioka station are more convenient as there are more numbers.